Quiz: C Arrays and Strings

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

Store many values in arrays, use 2D arrays, understand that C strings end with '\0', and use strlen, strcpy, strcat and strcmp safely — with classic programs.

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Question 1

What does this print?

#include <stdio.h>
#include <string.h>
int main(void) {
    char s[] = "hello";
    printf("%zu %zu", strlen(s), sizeof(s));
    return 0;
}

5 55 66 66 5

Question 2
What are the values of int a[5] = {1, 2};?
1, 2, garbage, garbage, garbage1, 2, 0, 0, 01, 2, 1, 2, 1Compile error
Question 3
How should you check if two C strings are equal?
if (a == b)if (strcmp(a, b) == 0)if (a.equals(b))if (strlen(a) == strlen(b))

Question 4

What does this print?

#include <stdio.h>
int main(void) {
    int a[] = {5, 10, 15, 20};
    printf("%d", a[1] + a[3]);
    return 0;
}

15302535

Question 5
Why is strcpy dangerous?
It's slowIt doesn't check the destination size, so it can overflow the bufferIt deletes the sourceIt only copies numbers