TMP

代码

#include 
#include 
#include 
#include 
using namespace std;
int main()
{
    char c=0;
    fstream f;
    f.open("test.dat", ofstream::out);
    if (f.fail())
    {
        cout << "打开文件错误!" << endl;
        exit(0);
    }
    cout << "请输入:\n";
    while ((c = getche())!='!') {
        if ('a' <= c && c <= 'z') {
            c = c - 'a' + 'A';
        }
        f << c;
    }
    f.close();
    cout << "保存成功" << endl;

}

结果

DAT文件