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Quiz: C Functions and Recursion

5 questionsNo time limitPass: 60%+10 XP on first pass

Write and call functions, declare prototypes, understand call by value with a picture, recursion with a base case, and the storage classes auto, static, extern and register.

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  1. Question 1

    What does this print?

    #include <stdio.h>
void change(int x) { x = 100; }
int main(void) {
    int a = 1;
    change(a);
    printf("%d", a);
    return 0;
}
  2. Question 2

    What does this print?

    #include <stdio.h>
int f(int n) {
    if (n == 0) return 0;
    return n + f(n - 1);
}
int main(void) {
    printf("%d", f(5));
    return 0;
}
  3. Question 3

    What does this print?

    #include <stdio.h>
int next(void) {
    static int n = 10;
    return n++;
}
int main(void) {
    next(); next();
    printf("%d", next());
    return 0;
}
  4. Question 4

    What is the default initial value of a static local int?

  5. Question 5

    What happens if a recursive function has no base case?