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;
}