#include #include int main(){    int i;    printf("before fork, my pid is %d\n" , getpid());    for (i=0; i<3; i++){        if ( fork()== 0 )            printf("Hi, I am child. My pid is %d\n", getpid());    } }

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Declaring and Defining the function

A set of statements, which performs a particular task is called a function. The program gains modularity by using function. The application is quite easy to understand, read, and edit when they are created with functions. The developer/programmer creates a function and uses main() to call the function. Once the function gets executed, the control is transferred to the main program.