求助！好迷啊，例子和测试点都没问题，还是全部WA

#include<bits/stdc++.h>
using namespace std;
char ch1[100][1000];
int a[10000],b[100][1000];
int main()
{
    int n,m,j;
    char ch2;
    cin>>n;
    scanf("%c",&ch2);
    for(int i=0;i<n;i++)
    {
        for(int j=0;;j++)
        {
            scanf("%c",&ch1[i][j]);
            if(ch1[i][j]=='\n')
            break;
        }
    }
    for(int i=0;i<n;i++)
    {
        j=0;
        if(ch1[i][0]=='a'||ch1[i][0]=='b'||ch1[i][0]=='c')
        j=2;
        while(ch1[i][j]<='9'&&ch1[i][j]>='0')
        {
            b[i][0]+=(ch1[i][j]-'0');
            b[i][0]*=10;
            j++;
        }
        b[i][0]/=10;
        j++;
        while(ch1[i][j]<='9'&&ch1[i][j]>='0')
        {
            b[i][1]+=ch1[i][j]-'0';
            b[i][1]*=10;
            j++;
        }
        b[i][1]/=10;
        if(ch1[i][0]<='9'&&ch1[i][0]>='0')
        {
            ch1[i][0]=ch1[i-1][0];
            b[i][4]+=2;
        }

        if(ch1[i][0]=='a')
        {
            b[i][3]=b[i][0]+b[i][1];
            m=b[i][3];
            while(m>0)
            {
                m/=10;
                b[i][4]++;
            }
            b[i][5]=strlen(ch1[i])+b[i][4]-2;
            cout<<b[i][0]<<"+"<<b[i][1]<<"="<<b[i][3]<<endl<<b[i][5]<<endl;
        }
        if(ch1[i][0]=='b')
        {
            b[i][3]=b[i][0]-b[i][1];
            if(b[i][3]<0)
            b[i][4]++;
            m=sqrt(b[i][3]);
            while(m>0)
            {
                m/=10;
                b[i][4]++;
            }
            b[i][5]=strlen(ch1[i])+b[i][4];
            cout<<b[i][0]<<"-"<<b[i][1]<<"="<<b[i][3]<<endl<<b[i][5]<<endl;
        }
        if(ch1[i][0]=='c')
        {
            b[i][3]=b[i][0]*b[i][1];
            m=b[i][3];
            while(m>0)
            {
                m/=10;
                b[i][4]++;
            }
            b[i][5]=strlen(ch1[i])+b[i][4]-2;
            cout<<b[i][0]<<"*"<<b[i][1]<<"="<<b[i][3]<<endl<<b[i][5]<<endl;
        }
    }
    return 0;
}