fatal error LNK1169: one or more multiply defined symbols found.

[madhan]

I am executing all my c/c++ programs in VC++ cmpiler.

#include <iostream>

using namespace std;

int main()
{
int age;
char sex;

cout<<"please input your age:";

cout<<"please input your sex (M/F):";
cin>> age;
cin>> sex;
if (age < 100) {
cout<<"you are pretty young!\n";
}
else if (age ==100 && sex == 'm')
{
cout<<"you are pretty old,and you are male!\n";
}
else if (age ==100 && sex == 'f')
{
cout<<"you are pretty old, and u r a female!\n";
}
else
{
cout<<"You are relly old!\n";
}
}

When I try to execute the above program,it gave the following error.
fatal error LNK1169: one or more multiply defined symbols found.
I tried google.com to correct this error by myself.But I counldn’t figure it out.Please help me.

[Dave Sinkula]

Please use code tags instead, and watch spaces like in using namespace or else if .

#include<iostream>

using namespace std;

int main()
{
   int age;
   char sex;

   cout<<"please input your age:";

   cout<<"please input your sex (M/F):";
   cin>> age;
   cin>> sex;
   if ( age < 100 )
   {
      cout<<"you are pretty young!\n";
   }
   else if ( age ==100 && sex == 'm' )
   {
      cout<<"you are pretty old,and you are male!\n";
   }
   else if ( age ==100 && sex == 'f' )
   {
      cout<<"you are pretty old, and u r a female!\n";
   }
   else
   {
      cout<<"You are relly old!\n";
   }
}

Any problem with this?

[madhan]

Thanks for your reply.But still after took care of spaces,it displays that same error.Please help me.I am new to programming.

#include<iostream>
usingnamespace std;
 
int main() 
{
int age; 
char sex;
 
cout<<"please input your age:"; 
 
cout<<"please input your sex (M/F):";
cin>> age; 
cin>> sex;

if (age < 100){ 
cout<<"you are pretty young!\n";
}else if (age == 100 && sex == 'm'){
cout<<"you are pretty old,and you are male!\n";
}else if (age == 100 && sex == 'f'){
cout<<"you are pretty old, and u r a female!\n";
}else{
cout<<"You are relly old!\n";
}
}

Also,i don't know,how to give programs in code.I used

[~s.o.s~]

The same program works fine with me.
Which OS and compiler (version) are u using?

[madhan]

OS-windows.XP

Compiler-Microsoft VC++ 2005 enterprise edition

Please help me.I couldn't able to correct that problem.

[Dave Sinkula]

There must be some information that you can see that you're not telling us. How did you set up the project? Are there other files in it? Etc.?

[madhan]

Yes,the project has 2 more files with it.I thought in one project we can place more files.

Thanks for the reply and help me.How can i run this file when more that one file is stored in same project.

[Dave Sinkula]

You can have more files, but as the linker seems to be telling you, you can't have the same thing defined in more than one place. I don't suppose you'd care to post all the relevant code?

[madhan]

This is the full error message

Ex2agesex.obj : error LNK2005: _main already defined in Ex1Sum.obj
Ex3currencydollar.obj : error LNK2005: _main already defined in Ex1Sum.obj
C:\Documents and Settings\Mohan.RBCHRIT7\My Documents\Visual Studio 2005\Projects\OwnPrograms\Debug\OwnPrograms.exe : fatal error LNK1169: one or more multiply defined symbols found
Build log was saved at "file://c:\Documents and Settings\Mohan.RBCHRIT7\My Documents\Visual Studio 2005\Projects\OwnPrograms\Debug\BuildLog.htm"
OwnPrograms - 3 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

How would i set some file as main to run in VC++

[Dave Sinkula]

Well there you go. You've got main defined in more than one file. You can only have one main . Just like the messages are saying. You need a single entry point to your program -- decide where it should be.

And again, if you want help with code, it is highly advisable that you post the code you want help with.

[madhan]

Dave thanks for your help and apologize for not asking my question properly.I thought that fatal error would be the problem for my program.

[madhan]

My first program in a project is

#define _CRT_SECURE_NO_DEPRECATE//to take of scanf deprecated warning
#include<stdio.h>
#include<math.h>
//int main()
{
int a,b;
double aSquare,bSquare,sumOfSquare;
printf("input first number\n");
scanf("%d",&a);
printf("input second number\n");
scanf("%d",&b);
printf("sum %d\n",a+b);
printf("average %d\n",(a+b)/2);
aSquare=sqrt(a);
bSquare=sqrt(b);
sumOfSquare=aSquare+bSquare;
printf("sumOfSquare %f\n",sumOfSquare);
}

As you told i have taken off main from it.and my second file is

#include <iostream>
using namespace std;
int main() 
{
int age; 
char sex;
 
cout<<"please input your age:"; 

cout<<"please input your sex (M/F):";
cin>> age; 
cin>> sex;
//cin.ignore(); 
if (age < 100){ 
cout<<"you are pretty young!\n";
}else if (age == 100 && sex == 'm'){
cout<<"you are pretty old,and you are male!\n";
}else if (age == 100 && sex == 'f'){
cout<<"you are pretty old, and u r a female!\n";
}else{
cout<<"You are relly old!\n";
}
// cin.get();
}

how can i call the first program in the second one.Displaying two programs output in second file.Please help me.

[Dave Sinkula]

Make it a function called something other than main , then call it from the other code.

[Tom_Zeke]

Thanks Dave. Your answer solved my problem as well.