error LNK2005: _main already defined in hold.obj

Hi Please i have browsed all same error that i got but I didnt get solving for my problem, so I am using MS VC++ 2010 and i have two files a.c and b.c, each one works no error alone and each one has a simple code and clear. But when i use them to gather shows this error **error LNK2005: _main already defined in a.c ** this same error shows on Code block IED. I think that refer to using main function twice. Now how can i use one main function for both file

Code file a.c

#include<stdio.h> #include<conio.h> main() { int a =9; if(a==7) { puts("This is number seven "); } else { puts("This isn't number seven "); } getch(); } 

Code file b.c

#include<stdio.h> #include<conio.h> main() { int x=10; printf("%d", x); getch(); } 

1 Answer

It is not possible to have two main functions, a program starts running in only 1 main function. You could rename the main functions, and create one main function that calls them both.

Code file a.c #include <stdio.h> #include <conio.h> void a_main() { int a =9; if(a==7) { puts("This is number seven "); } else { puts("This isn't number seven "); } getch(); } 

Code file b.c

#include <stdio.h> #include <conio.h> void main() { a_main(); b_main(); } void b_main() { int x=10; printf("%d", x); getch(); } 

Note, it is good practice to carfully name functions so that the names describe what they do. Eg, in this example you might call a_main PrintIs7OrNot and b_main Print10.