hello i have a question about #include

[lxlenovostar]

these code is :

//In.h
int sum(int a, int b);

//In.cpp

#include "In.h"

int sum(int a, int b)
{
return (a+b);
}

//test05.cpp

#include "iostream"
#include "In.h"
using namespace std;

int main()
{
int a = sum(1, 2);
cout << a << endl;
}

when i complier test05.cpp, it will have a question : ~/cpp/test$ g++ -o test05 test05.cpp /tmp/ccW55H4p.o: In function `main': test05.cpp:(.text+0x19): undefined reference to `sum(int, int)' collect2: ld returned 1 exit status give me some advides thank you

[Lost User]

You need to include In.cpp in your build thus:

~/cpp/test$ g++ -o test05 test05.cpp In.cpp

Just say 'NO' to evaluated arguments for diadic functions! Ash

[lxlenovostar]

thank you very much

[Lost User]

You're welcome. If you get bored some dark night you might want to read some of the documentation on g++, I think g++ --help gives you quite a lot of information.

Just say 'NO' to evaluated arguments for diadic functions! Ash