比较两个大整数的大小c语言函数

以下是比较两个大整数大小的C语言函数的例子：

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

int compare(char *a, char *b) {
    int len1 = strlen(a), len2 = strlen(b);
    if (len1 < len2) {
        return -1;
    } else if (len1 > len2) {
        return 1;
    } else {
        for (int i = 0; i < len1; i++) {
            if (a[i] < b[i]) {
                return -1;
            } else if (a[i] > b[i]) {
                return 1;
            }
        }
        return 0;
    }
}

int main() {
    char a[100], b[100];
    scanf("%s %s", a, b);
    int result = compare(a, b);
    if (result == -1) {
        printf("%s is smaller than %s\n", a, b);
    } else if (result == 1) {
        printf("%s is larger than %s\n", a, b);
    } else {
        printf("%s is equal to %s\n", a, b);
    }
    return 0;
}