Functions - General Questions

What is recursion?

What will be the output of the program?

#include <stdio.h>
int max3(int a, int b, int c) {
    int m = a;
    if (b > m) m = b;
    if (c > m) m = c;
    return m;
}
int main(void) {
    printf("%d\n", max3(4, 11, 7));
    return 0;
}

What happens when a recursive function has no base case?

What will be the output of the program?

#include <stdio.h>
int power(int b, int e) { return e == 0 ? 1 : b * power(b, e - 1); }
int main(void) {
    printf("%d\n", power(3, 4));
    return 0;
}

What is the default return type of a function in old (pre-C99) C if none is specified?