error LNK2005: _main already defined
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I recently installed VC++ 2005 EXP edition.
1) I created a project name Radius and created two new items hello.cpp and area.cpp.
2) area.cpp is the first item and hello.cpp is the second one.
3) When I build the project Radius, I got the error
LNK2005: _main already defined in area.obj
Can you guide me to fix the compilation error.
Thanks GKW82
Answers
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This error is because of multiple definitions of main. You must have defined main in area.cpp as well as in hello.cpp. In C/C++ programs, you can write only one main per application.
Remove one definition of main and it should work fine.
Cheers
All Replies
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Yes. I defined main() in both. I removed the main from hello and I am now getting the error
hello.cpp(4) : error C2447: '{' : missing function header (old-style formal list?)
GKW82
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Delete area.cpp and creat it.
Do the thing above.
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Nope.. didn't work. Getting the same error.
GKW82
- 0Pls. paste the hello.cpp code
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This is what MSDN says :
Error Message
'{' : missing function header (old-style formal list?)
An open brace occurs at global scope without a corresponding function header.
This error can be caused by an old-style C-language formal list.
The following sample generates C2447:
int c;
{} // C2447Check whether you are writing the open brace without the function name.
Else post the code.
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Here is the piece of code.
1) radius.cpp
#include
<iostream>/* program to calculate radius of a circle */
void
main(){
float area, radius;printf(
"Radius = ? ");scanf(
"%f", &radius);area = 3.14159 * radius * radius;
printf(
"Area = %f", area);}
2) hell.cpp
include
<iostream>{
printf(
"Hello world\n");}
c:\documents and settings\owner\my documents\visual studio 2005\projects\radius\radius\hello.cpp(4) : error C2447: '{' : missing function header (old-style formal list?)
GKW82
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Try the following....
1) radius.cpp
#include <iostream>
/* program to calculate radius of a circle */
void
main(){
float area, radius;
printf("Radius = ? ");
scanf("%f", &radius);
area = 3.14159 * radius * radius;
printf("Area = %f", area);
}
2) hell.cpp
include
<iostream>void function_name() // <---------------------------- did you miss this out?
{
printf(
"Hello world\n");}
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The whole problem starts when I include the function main() in the hello.cpp. I end up in getting the message
error LNK2005: _main already defined in hello.obj
GKW82.
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I think what you are trying to do is....
1.) File: hello.cpp
#include <IOSTREAM> #include <RADIUS.H> int main(int argc, char *argv[]) { float area = get_area(5); printf("Area of circle with radius %d = %f\n", 5, area); }2.) File: radius.h
float get_area(float radius); float get_circumference(float radius);
3.) File: radius.cpp
#include <RADIUS.H> float get_area(float radius) { return (3.14159 * radius * radius); } float get_circumference(float radius) { return (3.14159 * (radius * 2)); }
