Merge branch 'parser' into bigRefactoring

This commit is contained in:
JanUlrich 2018-02-28 11:53:53 +01:00
commit b66d06a165
17 changed files with 408 additions and 68 deletions

View File

@ -55,6 +55,7 @@ public class BytecodeGen implements ASTVisitor {
@Override
public void visit(SourceFile sourceFile) {
for(ClassOrInterface cl : sourceFile.getClasses()) {
System.out.println("in Class: " + cl.getClassName().toString());
BytecodeGen classGen = new BytecodeGen(classFiles, resultSet);
cl.accept(classGen);
classGen.writeClass(cl.getClassName().toString());
@ -183,7 +184,8 @@ public class BytecodeGen implements ASTVisitor {
System.out.println(sig);
NormalMethod meth = new NormalMethod(method,genericsAndBounds,genericsAndBoundsMethod,hasGen);
methDesc = meth.accept(new DescriptorToString(resultSet));
MethodVisitor mv = cw.visitMethod(acc, method.getName(), methDesc, sig, null);
System.out.println(methDesc);
MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC+acc, method.getName(), methDesc, sig, null);
mv.visitCode();

View File

@ -43,30 +43,28 @@ public class BytecodeGenMethod implements StatementVisitor{
private MethodVisitor mv;
private HashMap<String, Integer> paramsAndLocals = new HashMap<>();
private String className;
private int lamCounter;
private int lamCounter = -1;
private ClassWriter cw;
private ResultSet resultSet;
private boolean isInterface;
HashMap<String, String> genericsAndBoundsMethod;
private HashMap<String,String> genericsAndBounds;
private boolean isBinaryExp = false;
//for tests **
private String fieldName;
private String fieldDesc;
private Expression rightSideTemp;
// private String where;
private boolean isRightSideALambda = false;
private KindOfLambda kindOfLambda;
private HashMap<String, byte[]> classFiles;
private ArrayList<RefTypeOrTPHOrWildcardOrGeneric> varsFunInterface;
private ArrayList<RefTypeOrTPHOrWildcardOrGeneric> varsFunInterface = new ArrayList<>();;
public BytecodeGenMethod(String className,ResultSet resultSet, Method m, MethodVisitor mv,
HashMap<String, Integer> paramsAndLocals, ClassWriter cw, HashMap<String, String> genericsAndBoundsMethod,
HashMap<String,String> genericsAndBounds, boolean isInterface, HashMap<String, byte[]> classFiles) {
// this.where = "<<<<<< NORMAL METHOD >>>>>>";
this.className = className;
this.resultSet = resultSet;
this.m = m;
@ -77,9 +75,6 @@ public class BytecodeGenMethod implements StatementVisitor{
this.genericsAndBounds = genericsAndBounds;
this.isInterface = isInterface;
this.classFiles = classFiles;
this.lamCounter = -1;
this.varsFunInterface = new ArrayList<>();
if(!isInterface)
this.m.block.accept(this);
@ -89,13 +84,10 @@ public class BytecodeGenMethod implements StatementVisitor{
public BytecodeGenMethod(LambdaExpression lambdaExpression,ResultSet resultSet ,MethodVisitor mv,
int indexOfFirstParamLam, boolean isInterface, HashMap<String, byte[]> classFiles) {
// this.where = "<<<<<< LAMBDA METHOD >>>>>>";
this.resultSet = resultSet;
this.mv = mv;
this.isInterface = isInterface;
this.classFiles = classFiles;
this.lamCounter = -1;
this.varsFunInterface = new ArrayList<>();
Iterator<FormalParameter> itr = lambdaExpression.params.iterator();
int i = indexOfFirstParamLam;
@ -124,50 +116,61 @@ public class BytecodeGenMethod implements StatementVisitor{
public void visit(SuperCall superCall) {
superCall.receiver.accept(this);
superCall.arglist.accept(this);
// mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Object", superCall.name, desc,false);
mv.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(Object.class), superCall.name, "()V",isInterface);
}
// ??
@Override
public void visit(LocalVar localVar) {
// System.out.println("in Local Var: " + localVar.name);
mv.visitVarInsn(Opcodes.ALOAD, paramsAndLocals.get(localVar.name));
if(isBinaryExp) {
getVlaue(getResolvedType(localVar.getType()));
}
}
// ??
@Override
public void visit(LocalVarDecl localVarDecl) {
// Integer i;
// paramsAndLocals.put(localVarDecl.getName(), paramsAndLocals.size()+1);
// System.out.println("In localVarDecl :: "+localVarDecl.getName());
}
@Override
public void visit(Assign assign) {
// System.out.println("Assign : \nright = "+assign.rightSide + "\nLeft = " + assign.lefSide);
// if the right side is a lambda => the left side must be a functional interface
if(assign.rightSide.getClass().equals(LambdaExpression.class)) {
if(assign.rightSide instanceof LambdaExpression) {
isRightSideALambda = true;
}else {
isRightSideALambda = false;
}
if(assign.lefSide.getClass().equals(AssignToField.class)) {
if(assign.rightSide instanceof BinaryExpr)
isBinaryExp = true;
if(assign.lefSide instanceof AssignToField) {
// load_0, ldc or .. then putfield
this.rightSideTemp = assign.rightSide;
assign.lefSide.accept(this);
}else {
assign.rightSide.accept(this);
assign.lefSide.accept(this);
}
if(isBinaryExp) {
doAssign(getResolvedType(assign.lefSide.getType()));
isBinaryExp = false;
}
assign.lefSide.accept(this);
}
@Override
public void visit(BinaryExpr binary) {
System.out.println("\t++ In Binary: ");
binary.lexpr.accept(this);
binary.rexpr.accept(this);
switch (binary.operation.toString()) {
case "ADD":
mv.visitInsn(Opcodes.IADD);
break;
default:
break;
}
}
@Override
@ -236,7 +239,7 @@ public class BytecodeGenMethod implements StatementVisitor{
cw.visitInnerClass("java/lang/invoke/MethodHandles$Lookup", "java/lang/invoke/MethodHandles", "Lookup",
Opcodes.ACC_PUBLIC + Opcodes.ACC_STATIC + Opcodes.ACC_FINAL);
generateBCForFunN(lambdaExpression,typeErasure);
// generateBCForFunN(lambdaExpression,typeErasure);
}
private void generateBCForFunN(LambdaExpression lambdaExpression, String methDesc) {
@ -318,7 +321,7 @@ public class BytecodeGenMethod implements StatementVisitor{
@Override
public void visit(IfStmt ifStmt) {
System.out.println("If");
}
@Override
@ -329,12 +332,6 @@ public class BytecodeGenMethod implements StatementVisitor{
@Override
public void visit(MethodCall methodCall) {
// if(methodCall.receiver instanceof ExpressionReceiver){
// System.out.print(((ExpressionReceiver) methodCall.receiver).expr + "\n");
// }else{
// System.out.print(((StaticClassName) methodCall.receiver).getType().toString() + "\n");
// }
methodCall.receiver.accept(this);
methodCall.arglist.accept(this);
@ -342,8 +339,6 @@ public class BytecodeGenMethod implements StatementVisitor{
genericsAndBoundsMethod,genericsAndBounds);
String mDesc = method.accept(new DescriptorToString(resultSet));
// System.out.println("is Vars empty: "+varsFunInterface.isEmpty());
// is methodCall.receiver functional Interface)?
if(varsFunInterface.contains(methodCall.receiver.getType())) {
mv.visitMethodInsn(Opcodes.INVOKEINTERFACE, getResolvedType(methodCall.receiver.getType()),
@ -360,8 +355,6 @@ public class BytecodeGenMethod implements StatementVisitor{
@Override
public void visit(NewClass methodCall) {
// System.out.println("In NewClass: ");
// System.out.println("\t\tname: " + methodCall.name + " *** " + "Receiver: " + methodCall.receiver);
mv.visitTypeInsn(Opcodes.NEW, methodCall.name.replace(".", "/"));
mv.visitInsn(Opcodes.DUP);
@ -389,7 +382,7 @@ public class BytecodeGenMethod implements StatementVisitor{
@Override
public void visit(UnaryExpr unaryExpr) {
throw new NotImplementedException();
System.out.println(unaryExpr.operation.toString());
}
@Override
@ -435,7 +428,202 @@ public class BytecodeGenMethod implements StatementVisitor{
@Override
public void visit(Literal literal) {
mv.visitLdcInsn(getResolvedType(literal.getType()));
Object value = literal.value;
String typeOfLiteral = resultSet.resolveType(literal.getType()).resolvedType.acceptTV(new TypeToDescriptor());
if(this.isBinaryExp) {
getVlaue(typeOfLiteral);
}else {
doAssign(typeOfLiteral, value);
}
}
private void getVlaue(String typeOfLiteral) {
switch (typeOfLiteral) {
case "java/lang/String":
break;
case "java/lang/Boolean":
break;
case "java/lang/Byte":
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Byte", "valueOf",
"(B)Ljava/lang/Byte;", false);
break;
case "java/lang/Short":
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Short", "valueOf",
"(S)Ljava/lang/Short;", false);
break;
case "java/lang/Integer":
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Integer", "intValue",
"()I", false);
break;
case "java/lang/Long":
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Long", "valueOf",
"(J)Ljava/lang/Long;", false);
break;
case "java/lang/Float":
break;
case "java/lang/Double":
break;
case "java/lang/Character":
break;
default:
break;
}
}
private void doAssign(String type, Object value) {
switch (type) {
case "java/lang/String":
mv.visitLdcInsn(String.valueOf(value));
break;
case "java/lang/Boolean":
visitBooleanLiteral((Boolean) value);
break;
case "java/lang/Byte":
visitByteLiteral(((Double) value).byteValue(),false);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Byte", "valueOf",
"(B)Ljava/lang/Byte;", false);
break;
case "java/lang/Short":
visitShortLiteral(((Double) value).shortValue(),false);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Short", "valueOf",
"(S)Ljava/lang/Short;", false);
break;
case "java/lang/Integer":
//zweite Argument isLong
visitIntegerLiteral(((Double) value).intValue(), false);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Integer", "valueOf",
"(I)Ljava/lang/Integer;", false);
break;
case "java/lang/Long":
visitLongLiteral(((Double) value).longValue(), true);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Long", "valueOf",
"(J)Ljava/lang/Long;", false);
break;
case "java/lang/Float":
visitFloatLiteral(((Double) value).floatValue());
break;
case "java/lang/Double":
visitDoubleLiteral((Double) value);
break;
case "java/lang/Character":
visitCharLiteral((Character) value);
break;
default:
break;
}
}
private void doAssign(String type) {
switch (type) {
case "java/lang/String":
break;
case "java/lang/Boolean":
break;
case "java/lang/Byte":
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Byte", "valueOf",
"(B)Ljava/lang/Byte;", false);
break;
case "java/lang/Short":
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Short", "valueOf",
"(S)Ljava/lang/Short;", false);
break;
case "java/lang/Integer":
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Integer", "valueOf",
"(I)Ljava/lang/Integer;", false);
break;
case "java/lang/Long":
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Long", "valueOf",
"(J)Ljava/lang/Long;", false);
break;
case "java/lang/Float":
break;
case "java/lang/Double":
break;
case "java/lang/Character":
break;
default:
break;
}
}
private void visitCharLiteral(Character value) {
mv.visitIntInsn(Opcodes.BIPUSH, (int) value);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Character", "valueOf",
"(C)Ljava/lang/Character;", false);
}
private void visitDoubleLiteral(Double value) {
if(value == 0) {
mv.visitInsn(Opcodes.DCONST_0);
}else if(value == 1) {
mv.visitInsn(Opcodes.DCONST_1);
}else {
mv.visitLdcInsn(value);
}
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Double", "valueOf",
"(D)Ljava/lang/Double;", false);
}
private void visitFloatLiteral(Float value) {
if(value.intValue()>-1 && value.intValue() < 3) {
//Opcodes.FCONST_0 = 11, Opcodes.FCONST_1 = 12, usw
mv.visitInsn(value.intValue()+11);
}else {
mv.visitLdcInsn(value);
}
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Float", "valueOf",
"(F)Ljava/lang/Float;", false);
}
private void visitLongLiteral(Long value, boolean isLong) {
if(value<Math.pow(2, 15) || (value>=-Math.pow(2, 15))&&value<-128) {
visitShortLiteral(value.shortValue(),isLong);
}else {
mv.visitLdcInsn(value);
}
}
private void visitShortLiteral(Short value,boolean isLong) {
if(value< 128 || (value>-129 && value<-1)) {
visitByteLiteral(value.byteValue(), isLong);
}else if(value<Math.pow(2, 15) || (value>=-Math.pow(2, 15))&&value<-128) {
mv.visitIntInsn(Opcodes.SIPUSH, value);
}
}
private void visitByteLiteral(Byte value, boolean isLong) {
if(!isLong && value<6 && value>-1) {
//Opcodes.ICONST_0 = 3, Opcodes.ICONST_1 = 4, usw
mv.visitInsn(value+3);
}else if(isLong && value>-1 && value<2){
//Opcodes.LCONST_0 = 9, Opcodes.LCONST_1 = 10
mv.visitInsn(value+9);
}else {
mv.visitIntInsn(Opcodes.BIPUSH, value);
}
}
private void visitIntegerLiteral(Integer value, boolean isLong) {
if(value<Math.pow(2, 15) || (value>=-Math.pow(2, 15))&&value<-128) {
visitShortLiteral(value.shortValue(),isLong);
}else {
mv.visitLdcInsn(value);
}
}
private void visitBooleanLiteral(Boolean b) {
if(b) {
mv.visitInsn(Opcodes.ICONST_1);
}else {
mv.visitInsn(Opcodes.ICONST_0);
}
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Boolean", "valueOf",
"(Z)Ljava/lang/Boolean;", false);
}
@Override

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@ -132,9 +132,10 @@ public class Signature {
break;
case "TPH":
RefTypeOrTPHOrWildcardOrGeneric r = resultSet.resolveType(t).resolvedType;
sv.visitInterface().visitClassType(r.acceptTV(new TypeToSignature()));
if(!r.acceptTV(new TypeToSignature()).substring(0, 4).equals("TPH "))
sv.visitInterface().visitClassType(r.acceptTV(new TypeToSignature()));
// sv.visitClassType(r.acceptTV(new TypeToSignature()));
// System.out.println(r.getClass()+" Signature TPH: "+r.acceptTV(new TypeToSignature()));
System.out.println(r.getClass()+" Signature TPH: "+r.acceptTV(new TypeToSignature()));
break;
default:
if(!isParameterType)

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@ -7,6 +7,7 @@ import de.dhbwstuttgart.parser.scope.GenericsRegistry;
import de.dhbwstuttgart.parser.scope.JavaClassRegistry;
import de.dhbwstuttgart.syntaxtree.*;
import de.dhbwstuttgart.syntaxtree.statement.*;
import de.dhbwstuttgart.syntaxtree.statement.UnaryExpr.Operation;
import de.dhbwstuttgart.syntaxtree.type.RefType;
import de.dhbwstuttgart.syntaxtree.type.RefTypeOrTPHOrWildcardOrGeneric;
import de.dhbwstuttgart.syntaxtree.type.TypePlaceholder;
@ -278,13 +279,14 @@ public class StatementGenerator {
}
private Statement convert(Java8Parser.PreIncrementExpressionContext stmt) {
//TODO
throw new NotImplementedException();
Expression argument = convert(stmt.unaryExpression());
Token offset = stmt.getStart();
return new UnaryExpr(UnaryExpr.Operation.PREINCREMENT, argument, TypePlaceholder.fresh(offset), offset);
}
private Statement convert(Java8Parser.PreDecrementExpressionContext stmt) {
//TODO
throw new NotImplementedException();
private Statement convert(Java8Parser.PreDecrementExpressionContext stmt) {
return new UnaryExpr(UnaryExpr.Operation.PREDECREMENT, convert(stmt.unaryExpression()),
TypePlaceholder.fresh(stmt.getStart()), stmt.getStart());
}
private Statement convert(Java8Parser.PostIncrementExpressionContext stmt) {
@ -293,8 +295,8 @@ public class StatementGenerator {
}
private Statement convert(Java8Parser.PostDecrementExpressionContext stmt) {
//TODO
throw new NotImplementedException();
return new UnaryExpr(UnaryExpr.Operation.POSTDECREMENT, convert(stmt.postfixExpression()),
TypePlaceholder.fresh(stmt.getStart()), stmt.getStart());
}
private Statement convert(Java8Parser.AssignmentContext stmt) {
@ -599,8 +601,31 @@ public class StatementGenerator {
}
private BinaryExpr.Operator convertBinaryOperator(String operator) {
return null;
//return BinaryExpr.Operator.ADD;
if(operator.equals("+")) {
return BinaryExpr.Operator.ADD;
}else if(operator.equals("-")) {
return BinaryExpr.Operator.SUB;
}else if(operator.equals("*")) {
return BinaryExpr.Operator.MUL;
}else if(operator.equals("&")) {
return BinaryExpr.Operator.AND;
}else if(operator.equals("|")) {
return BinaryExpr.Operator.OR;
}else if(operator.equals("/")) {
return BinaryExpr.Operator.DIV;
}else if(operator.equals("<")) {
return BinaryExpr.Operator.LESSTHAN;
}else if(operator.equals(">")) {
return BinaryExpr.Operator.BIGGERTHAN;
}else if(operator.equals(">=")) {
return BinaryExpr.Operator.BIGGEREQUAL;
} else if(operator.equals("<=")) {
return BinaryExpr.Operator.LESSEQUAL;
} else {
throw new NotImplementedException();
}
// throw new NotImplementedException();
}
private Expression convert(Java8Parser.ShiftExpressionContext expression) {
@ -612,12 +637,15 @@ public class StatementGenerator {
}
private Expression convert(Java8Parser.AdditiveExpressionContext expression) {
if(expression.additiveExpression() != null){
return convert(expression.additiveExpression());
}else if(expression.multiplicativeExpression() != null){
if(expression.additiveExpression() == null){
return convert(expression.multiplicativeExpression());
}else{
throw new NotImplementedException();
}else {
Expression leftSide = convert(expression.additiveExpression());
Expression rightSide = convert(expression.multiplicativeExpression());
BinaryExpr.Operator op = convertBinaryOperator(expression.getChild(1).getText());
Token offset = expression.getStart();
return new BinaryExpr(op, TypePlaceholder.fresh(expression.getStart()), leftSide, rightSide, offset);
}
}
@ -625,7 +653,11 @@ public class StatementGenerator {
if(expression.multiplicativeExpression() == null){
return convert(expression.unaryExpression());
}else{
throw new NotImplementedException();
Expression leftSide = convert(expression.multiplicativeExpression());
Expression rightSide = convert(expression.unaryExpression());
BinaryExpr.Operator op = convertBinaryOperator(expression.getChild(1).getText());
Token offset = expression.getStart();
return new BinaryExpr(op, TypePlaceholder.fresh(offset), leftSide, rightSide, offset);
}
}
@ -793,7 +825,9 @@ public class StatementGenerator {
}else if(literal.CharacterLiteral() != null){
RefType type = new RefType(reg.getName("java.lang.Character"),literal.getStart());
return new Literal(type,
literal.CharacterLiteral().getText().charAt(0),
// das gibt immer ' zurück, der Char befindet sich in Position 1
//literal.CharacterLiteral().getText().charAt(0),
literal.CharacterLiteral().getText().charAt(1),
literal.getStart());
}else if(literal.StringLiteral()!=null){
RefType type = new RefType(reg.getName("java.lang.String"),literal.getStart());

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@ -0,0 +1,30 @@
import java.lang.Integer;
import java.lang.Boolean;
import java.lang.String;
import java.lang.Byte;
import java.lang.Short;
import java.lang.Long;
import java.lang.Float;
import java.lang.Double;
import java.lang.Character;
class AssignToLit {
void m(){
// String s = "Test";
// Boolean b = false;
// Byte byte1 = 5;
// Byte byte2 = 55;
// Short short1 = 5;
// Short short2 = 55;
// Integer int1 = 5;
// Integer int2 = 8888888;
// Long long1 = 1;
// Long long2 = 5;
// Long long3 = 89989898;
// Float float1 = 1;
// Float float2 = 55;
// Double d1 = 1;
// Double d2 = 55;
Character c = 'A';
}
}

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@ -0,0 +1,7 @@
package bytecode;
public class AssignToLitTest extends JavaTXCompilerTest {
public AssignToLitTest() {
this.fileName = "AssignToLit";
}
}

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@ -1,7 +1,9 @@
import java.lang.String;
public class Example {
public m(Integer x) {
// String x = "X";
public m() {
String x = "X";
return x;
}
}

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@ -1,13 +1,30 @@
import java.lang.Integer;
import java.lang.Boolean;
class For{
m(Integer x){
Boolean b = true;
while(x<2){
x = x +1;
b = false;
}
return x;
Integer m(Integer x){
var c = x + 2;
// Boolean b = true;
// c = 5;
// c++;
// ++c;
// c--;
// --c;
// while(x<2){
// x = x +1;
// b = false;
// }
return c;
// for(int i = 0;i<10;i++) {
// x = x + 5;
// }
}
// m2(Integer x){
// if(x<2) {
// return 1;
// }else {
// return 2;
// }
// }
}

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@ -1,5 +1,7 @@
package bytecode;
import org.objectweb.asm.Opcodes;
public class ForTest extends JavaTXCompilerTest {
public ForTest() {

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@ -67,7 +67,7 @@ public class JavaTXCompilerTest {
byte[] bytecode = classFiles.get(name);
try {
System.out.println("generating "+name+ ".class file ...");
output = new FileOutputStream(new File(System.getProperty("user.dir") + "/testBytecode/generatedBC/examples/" +name+".class"));
output = new FileOutputStream(new File(System.getProperty("user.dir") + "/testBytecode/generatedBC/" +name+".class"));
output.write(bytecode);
output.close();
System.out.println(name+".class file generated");

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@ -9,3 +9,7 @@ class LamAssign {
return lam1;
}
}
interface Fun1<A,B>{
public A apply(B b);
}

14
test/bytecode/Methods.jav Normal file
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@ -0,0 +1,14 @@
import java.lang.Integer;
class Methods {
m(a,b){
var c=a+b;
return c;
}
method2(x){
Integer i = this.m(x,2);
return i;
}
}

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@ -0,0 +1,7 @@
package bytecode;
public class MethodsTest extends JavaTXCompilerTest {
public MethodsTest() {
this.fileName = "Methods";
}
}

12
test/bytecode/Op.jav Normal file
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@ -0,0 +1,12 @@
import java.lang.Integer;
class Op {
m(Integer a, Integer b) {
Integer c = a+b;
// d = a-b;
// e = a*b;
// f = a/b;
return c;
}
}

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@ -0,0 +1,7 @@
package bytecode;
public class OpTest extends JavaTXCompilerTest {
public OpTest() {
this.fileName = "Op";
}
}

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@ -41,7 +41,8 @@ public class GeneralParserTest{
filenames.add("FieldVarTest.jav");
filenames.add("StructuralTypes.jav");
*/
filenames.add("ExtendsTest.jav");
// filenames.add("ExtendsTest.jav");
filenames.add("OpratorTest.jav");
try{
new JavaTXCompiler(filenames.stream().map(s -> new File(rootDirectory + s)).collect(Collectors.toList()));
}catch(Exception exc){

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@ -0,0 +1,12 @@
import java.lang.Integer;
class OpratorTest {
m(Integer a, Integer b) {
c = a+b;
// d = a-b;
// e = a*b;
// f = a/b;
return c;
}
}