无内鬼，来个大佬告诉蒟蒻这个哪里错了（

#include<iostream>
#include<cstring>
using namespace std;
int main (){
    char a[100];
    char c[100];
    memset(a,'a',sizeof(a));
    cin >> a;
    int b = 0;
    int d = 0;
    int e = 0;
    for (int i = 0; i < 100; i ++) if (a[i] != 'a') b ++;
    if (a[0] != '-')  for (int i = b - 1; i >= 0; i --) {
        if (a[i] != '0') d = b;
    }
    else for (int i = b - 1; i > 0; i --) {
        if (a[i] != '0') d = b;
    }
    if (a[0] != '-') for (int i = b; i >= 0; i --) {
        c[e] = a[i];
        e ++;
    }
    else for (int i = b; i > 0; i --) {
        c[e] = a[i];
        e ++;
    }
    int f;
    for (int i = 2; i <= b; i ++) if (c[i] != '0') {
        f = i;
        break;
    } 
    if (a[0] != '-') for (int i = f; i <= b; i ++) cout << c[i] ;
    else {
        cout << "-";
        for (int i = f; i <= b; i ++) cout << c[i] ;
    }
    return 0;
} 

感觉输出没毛病啊（ 我输入-290出来也是-92但是就是过不了（ 求解惑（