麻烦大佬看一下80分感觉没有特判0谢谢

#include <stdio.h>
#include <string.h>
int len(int b, int c, char t) {
    int o = 0;int count = 0;
    if (t == '+') { o = b + c; }
    if (t == '-') { o = b - c; }
    if (t == '*') { o = b * c; }
    while (b > 0) { b /= 10; count++; }while (c > 0) { c /= 10; count++; }while (o != 0) { if (o > 0) { o /= 10; count++; } else { o *= (-1); } }return count;
}  
    int main() {
        int u[100] = { 0 };
int n = 0; scanf("%d", &n);  char t[100];   int b[100] = { 0 }, c[100] = { 0 };
    for (int i = 0; i < n; i++) {

        if (scanf("%d %d", &b[i], &c[i]) == 2) {
            if (t[i - 1] == 'a') {   u[i] = len(b[i], c[i], '+') + 2; t[i] = 'a';  }
            if (t[i - 1] == 'b') {
                if (b[i] - c[i] < 0)u[i] = len(b[i], c[i], '-') + 3; else { u[i] = len(b[i], c[i], '-') + 2; } t[i] = 'b';
            }
            if (t[i - 1] == 'c') { u[i] = len(b[i], c[i], '*') + 2; t[i] = 'c';
            }
        } else {
            scanf("%c %d %d", &t[i], &b[i], &c[i]);    if (t[i] == 'a') { u[i] = len(b[i], c[i], '+') + 2; }
            if (t[i] == 'b') {
                if (b[i] - c[i] < 0)u[i] = len(b[i], c[i], '-') + 3; else u[i] = len(b[i], c[i], '-') + 2;
            }
            if (t[i] == 'c') { u [i] = len(b[i], c[i], '*') + 2; }
        }}
    for(int i=0;i<n;i++){
        if (t[i] == 'a') { printf("%d+%d=%d\n%d\n", b[i], c[i], b[i] + c[i], u[i]); }
        if (t[i] == 'b') { printf("%d-%d=%d\n%d\n", b[i], c[i], b[i] - c[i], u[i]); }
        if (t[i] == 'c') { printf("%d*%d=%d\n%d\n", b[i], c[i], b[i] * c[i], u[i]); }
        }
    return 0;
}