I haven't found the mistake

[amchinese]

I just write a new program. It can run, but it doesn't output the true number. Here are some of the codes:
input codes:(ck means subject NO. and cj means grades)

	int where=-1;
	do
	{
		where++;
		cin>>cj[kc][where];
		if(where>=100)
		{
			cout<<"too much numbers!\n";
			break;
		}
	}while(cj[0][where]>=0);

output codes:

		case 'M': 
			s=cj[kc][0];
			for(i=0;i<100&&cj[kc][i]>=0;i++)
			{
				if(cj[kc][i]>=s)
					s=cj[kc][i];
			}
			cout<<"Highest score："<<s<<endl;
			break;
		case 'L':
			s=100;
			for(i=0;i<100&&cj[kc][i]>=0;i++)
			{
				if(cj[kc][i]<s)
					s=cj[kc][i];
			}
			cout<<"Minimum fraction："<<s<<endl;
			break;
		case 'P':
			s=j=0;
			for(i=0;i<100&&cj[kc][i]>=0;i++)
			{
				if(cj[kc][i]>=60)
					s++;
				else
					j++;
			}
			cout<<"Pass ratio："<<(int)(s*100/(s+j))<<"%"<<endl;
			break;
		case 'E':
			s=j=0;
			for(i=0;i<100&&cj[kc][i]>=0;i++)
			{
				if(cj[kc][i]>=85)
					s++;
				else
					j++;
			}
			cout<<"Excellent proportion："<<(int)(s*100/(s+j))<<"%"<<endl;
			break;

output:

57 0 0 0 0

[Chervil]

I don't see where your output is produced. All the above code has a string, such as "Pass ratio:".

This line in the input section made me hesitate:

    }while(cj[0][where]>=0);

I wondered whether it should have been

    }while(cj[kc][where]>=0);

[amchinese]

I just want to tell you that the output number is not true. You know, I can't copy the output string, so I just enter the numbers to show to you.