please help me retrenchment my project or change other form by java.

#include

#include

#include

#include

#include

using namespace std;

const ostream& stackTrace(ostream& out, stack callStack){

while(callStack.size() > 0){

out << callStack.top() << endl;

callStack.pop();

}

return out;

}

int main(int argc, char **argv) {

string line;

string command;

string functionName;

string poppedFunction;

bool errorDetected = false;

bool errorNoFunction = false;

bool errorWrongFunction = false;

stack callStack;

size_t lineNumber = 0;

size_t maximumDepth = 0;

while (getline(cin, line) && errorDetected == false) {

lineNumber++;

stringstream parser(line);

parser >> command >> functionName;

//add the function name to the stack

if(command == "call"){

callStack.push(functionName);

}

else if(command == "return"){

//check to see if the maxiumum depth of the stack has been reached

if(callStack.size() > maximumDepth){

maximumDepth = callStack.size();

}

//check to make sure the stack isnt empty

if(callStack.size() == 0){

errorDetected = true;

errorNoFunction = true;

}

//check to make sure the function name matches before popping

else if(callStack.top() != functionName){

errorDetected = true;

errorWrongFunction = true;

}

//pop the stack

else{

callStack.pop();

}

}

else{

errorDetected = true;

}

//clear the stringstream for the next command

parser.clear();

}

if(errorNoFunction){

cout << "Invalid trace at line " << lineNumber << endl;

cout << "Returning from " << functionName

<< " but no functions are currently being called" << endl;

cout << "Stack trace:" << endl;

//do a stack trace

stackTrace(cout,callStack);

}

else if(errorWrongFunction){

cout << "Invalid trace at line " << lineNumber << endl;

cout << "Returning from " << functionName << " instead of "

<< callStack.top() << endl;

cout << "Stack trace:" << endl;

//do a stack trace

stackTrace(cout,callStack);

}

else if((callStack.size() > 0)){

cout << "Invalid trace at line " << lineNumber << endl;

cout << "Not all functions returned" << endl;

cout << "Stack trace:" << endl;

//do a stack trace

stackTrace(cout,callStack);

}

else{

cout << "Valid trace" << endl;

cout << "Maximum call depth was " << maximumDepth << endl;

}

return 0;

}

please help me make the code shorter and clearer,

Thanks