C004：要求用户输入一个美元数量，然后显示出增加5%税率后的相应金额

程序：

#include "stdafx.h"

int _tmain(int argc, _TCHAR* argv[])
{
    float amount;

    do{
        printf("Enter an amount:");
        scanf("%f",&amount);

        float added=1.05f*amount;
        printf("With tax added:$%1.2f\n",added);
    }while(amount!=);

    return ;
}

输出：

Enter an amount:
With tax added:$105.00
Enter an amount:
With tax added:$24.15
Enter an amount:
With tax added:$1282.05
Enter an amount:
With tax added:$2227.05
Enter an amount:
With tax added:$2227.05
Enter an amount:
With tax added:$2227.05
Enter an amount:
With tax added:$222.60
Enter an amount:
With tax added:$127.05
Enter an amount:
With tax added:$22.05
Enter an amount:
With tax added:$1050.00
Enter an amount:

--2020年6月9日--