Question

I have 2 C programs.
Say one is program-1.c

int main(){
printf("hello world");
}

Now in 2nd code named program-2.c, I want the output of 1st code into a variable,
so that I can have the output “hello world” into a variable in the 2nd C code.

How can I do this?

Answer 1

You can use the popen function for this:

FILE* proc1 = popen("./program1", "r");
// Usual error handling code goes here
// use the usual FILE* read functions
pclose(proc1);