＆＃34;错误答案＆＃34;在HackerRank＆＃34;第2天：运营商＆＃34;挑战

Question

我是新手程序员和编码员。所以，我在HackerRank中花了30天的编码挑战，但是当我在C中运行the "Day 2: Operators" problem时，它没有显示任何错误。代码是：

#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int main() {
    int total;
    double meal_cost; 
    scanf("%lf", &meal_cost);
    int tip_percent; 
    scanf("%i", &tip_percent);
    int tax_percent; 
    scanf("%i", &tax_percent);
    double tip=(meal_cost*tip_percent)/100;
    double tax=(meal_cost*tax_percent)/100;
    total=(int)(meal_cost + tip + tax);
    printf("The total meal cost is %d dollars.",total);
    printf("The total meal cost is %d dollars.",total);
    return 0;
}

输入：

12.00
20
8

预期产出：

The total meal cost is 15 dollars.

实际输出：

Wrong Answer

Answer 1

这是更清晰的方案。因为发现提示不征税。

计算在double上完成，以避免早期截断。最终结果打印为double或根据需要Hackerrank四舍五入到int个数字。

非常感谢Weather Vane的贡献和帮助。

#include <math.h>
#include <stdio.h>
#include <stdlib.h>

int main() {

    double total, meal_cost, tip_percent, tax_percent, tip, tax; 

    scanf("%lf", &meal_cost);
    scanf("%lf", &tip_percent);
    scanf("%lf", &tax_percent);        

    tip  =  (meal_cost*tip_percent/100.0);
    tax  =  (meal_cost*tax_percent)/100.0;

    // Tip taxed:
    // tax  =  (meal_cost + tip) * (tax_percent/100.0);
    // no tax on the tip:
    tax  =  meal_cost * (tax_percent/100.0);

    total=  meal_cost + tip + tax;

    printf("The total meal cost is %.2f dollars.\n",total);
    printf("The total meal cost is %d dollars.\n",  (int)(total+0.5));

    return 0;
}

输出：

12
20
8
The total meal cost is 15.36 dollars.
The total meal cost is 15 dollars.

Answer 2

C中的运行代码“第2天：运算符”问题

-给定餐费（餐的基本费用）的小费百分比（
   膳食价格的百分比作为小费）和税率百分比
   （一顿饭中所含进餐价格的百分比），
   在HackerRank中查找并打印餐点的总费用

#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main() {
double total, meal_cost, tip_percent, tax_percent, tip, tax;
scanf("%lf", &meal_cost);
scanf("%lf", &tip_percent);
scanf("%lf", &tax_percent);        

tip  =  (meal_cost*tip_percent/100.0);
tax  =  (meal_cost*tax_percent)/100.0;
// Tip taxed:
// tax  =  (meal_cost + tip) * (tax_percent/100.0);
// no tax on the tip:
tax  =  meal_cost * (tax_percent/100.0);
total=  meal_cost + tip + tax;
printf("%d",  (int)(total+0.5));

return 0;  }

输入

12.0 20 8

输出

15