Lexicographical String Checker

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

int lexCompare(char* a, char* b){
    int i;
    int r = strlen(a);
    int q = strlen(b);

    // ret 1 for a is small &&& ret -1 for b is small

    for(i=0;(i<r||i<q);i++){

        if(a[i] == '\0') return 1;
        else if(b[i] == '\0') return -1;

        else if(a[i] < b[i]){
            return 1;
        }
        else if(a[i] > b[i]){
            return -1;
        }

    }
    return 0;
}
int main() {
    char str1[] = "Zeo", str2[] = "Zed";

    printf("The result is : %d",
           lexCompare(str1,str2)
    );


    return 0;
}