printf error

[toks]

Hello friends,

i have a code below:

#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>

int main(void){
		pid_t h;
		
		h = fork();
		if (h==0) {
			printf("Hello i am child %d");
		}
		else if (h>0) {
			printf("Hello i am parent %d");
		}
		else {
			printf("fork error!\n");
		return 0;
		}
	}
		
	return 0;
}

and i would like to ask:
i receive an error from the compiler:

`printf' was not declared in this scope

, any idea how to solve it. (i tried using cout, but i still receive the same error). i compile the program using g++.


Any help will be appreciated.

Thank you.

[Moschops]

printf lives in cstdio. std::cout lives in ostream.

You must declare the functions by including appropriate headers.

[codist]

Just put #include <stdio.h> at the top of your code.

[Zhuge]

Looks like C code, so I would say #include <stdio.h>

[firedraco]

i compile the program using g++.

So you'd want <cstdio> wouldn't you?

[toks]

Thanks very much everyone for the reply ! yeah, with printf i had to include stdio header or with cout the iostream header.

[Zhuge]

Didn't notice that line. In that case, you ought to also use cstdlib instead of stdlib.h
Though TBH, if you are writing C++ you should just use the C++ libraries instead of the C standard library.