#include<iostream>
using namespace std;
int main()
{
    char str[30];
    char * sp=str;
    cout<<"请输入字符串:"<<endl;
    cin.getline(sp,30);  //也可以(str,30)
    cout<<"输出大写字母:"<<endl;
    for(;*sp!='\0';sp++)
        {
            if(*sp>='A'&&*sp<='Z')
            {
                cout<<*sp<<" ";
            }
        }
    return 0;
}

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