Question

FOR C PROGRAMMING LANGUAGE

Write a recursive C PROGRAMMING LANGUAGE function int sumStrlens(const char* str1, const char* str2) which returns the sum of strlen(str1) and strlen(str2). You can assume that strlen(str2) is always strictly greater than strlen(str1) (strlen(str2) > strlen(str1)). You MAY NOT use any function from string.h. You MAY NOT use any square brackets([]) or any type of loops in function.

Answer 1

#include <stdio.h>

int sumStrlens(const char *str1, const char *str2);

int main() {
    printf("%d\n", sumStrlens("Hello", "How are you?"));
    return 0;
}

int sumStrlens(const char *str1, const char *str2) {
    if (!(*str1)) {
        if (!(*str2)) {
            return 0;
        } else {
            return 1 + sumStrlens(str1, str2 + 1);
        }
    } else {
        return 1 + sumStrlens(str1 + 1, str2);
    }
}