Library Functions - General Questions

What will be the output of the program?

#include <stdio.h>
#include <string.h>

int main(void) {
    printf("%d\n", (int)strlen("library"));
    return 0;
}

What will be the output of the program?

#include <stdio.h>
#include <string.h>

int main(void) {
    char s[10];
    memset(s, '*', 3);
    s[3] = '\0';
    printf("%s\n", s);
    return 0;
}