#include <stdio.h>
void s(int n1, int n2)
{
    printf("%d + %d = %d \n", n1, n2, n1+n2);
}
void sh(char * st)
{
    printf("%s \n", st);
}

int main() {
    char * st="fun";
    int num1=10, num2=20;

    void (*f)(int, int) = s;
    void (*f2)(char *) = sh;

    f(num1, num2);
    f2(st);
    return 0;
}