#include<iostream.h>
void main()
{
    char a[8],b[8];

    int i=0,j=0;
    cout<<"please input a:";
    do
    {
        cin>>a[i];
    }while(a[i]!='\n');
    cout<<"please input b:";
    do
    {
        cin>>b[i];
    }while(b[i]!='\n');
        
    if(a[0]==b[0])
        cout<<"they are equal!"<<endl;
    else if(a[0]=='r'&&b[0]=='s')
        cout<<"the winner is a!"<<endl;
    else if(a[0]=='r'&&b[0]=='c')
        cout<<"the winner is b!"<<endl;
    else if(a[0]=='c'&&b[0]=='s')
        cout<<"the winner is b!"<<endl;
    else if(a[0]=='c'&&b[0]=='r')
        cout<<"the winner is a!"<<endl;
    else if(a[0]=='s'&&b[0]=='r')
        cout<<"the winner is b!"<<endl;
    else if(a[0]=='s'&&b[0]=='c')
        cout<<"the winner is a!"<<endl;
}
红色字输出不了，前面的赋值也不成功，求解释

#include<iostream.h>
void main()
{
    char a[8],b[8];
    int i=0,j=0;



    cout<<"please input a:";
    cin>>a[i];
    while(a[i]!='\n')
    {
        i++;
        cin>>a[i];
    }
    cout<<"please input b:";
    cin>>b[j];
    while(b[j]!='\n')
    {
        j++;
        cin>>b[j];
    }


        
    if(a[0]==b[0])
        cout<<"they are equal!"<<endl;
    else if(a[0]=='r'&&b[0]=='s')
        cout<<"the winner is a!"<<endl;
    else if(a[0]=='r'&&b[0]=='c')
        cout<<"the winner is b!"<<endl;
    else if(a[0]=='c'&&b[0]=='s')
        cout<<"the winner is b!"<<endl;
    else if(a[0]=='c'&&b[0]=='r')
        cout<<"the winner is a!"<<endl;
    else if(a[0]=='s'&&b[0]=='r')
        cout<<"the winner is b!"<<endl;
    else if(a[0]=='s'&&b[0]=='c')
        cout<<"the winner is a!"<<endl;
}
很不好意思，我改了一下，还是不行，能不能帮忙再看看，谢谢了。。