全WA，下载数据也测试过了

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main() 
{
    int n;
    char f='\0';
    scanf("%d",&n);
    getchar();
    while(n--)
    {
    int x,y,z=0,sum=0;
    char s[1000]="\0",line[1000]="\0";
    gets(s);
    if(s[0]=='a') z=1,f='+';
    else if(s[0]=='b') z=1,f='-';
    else if(s[0]=='c') z=1,f='*';
    if(z) sscanf(s+1,"%d%d",&x,&y);
    else sscanf(s,"%d%d",&x,&y);
    if(f=='+') sum=x+y;
    else if(f=='-') sum=x-y;
    else if(f=='*') sum=x*y;
    sprintf(line,"%d%c%d=%d",x,f,y,sum);    
    printf("%s\n%d\n",line,strlen(line)); 
    }
    return 0;
}