作业一：运费计算

#include <stdio.h>

int main() {
    float p, w, s, d, f;
    printf("请输入基本运费p，货物重w，距离s：\n");
    scanf_s("%f,%f,%f", &p, &w, &s);
    int n = s / 250;
    switch (n) {
    case 0:
        d = 0;
        break;
    case 1:
        d = 0.02;
        break;

    case 2:
    case 3:
        d = 0.05;
        break;

    case 4:
    case 5:
    case 6:
    case 7:
        d = 0.08;
        break;

    case 8:
    case 9:
    case 10:
    case 11:
        d = 0.1;
        break;
    default:
        d = 0.15;
        break;
    }
    f = p * w * s * (1 - d);
    printf("总运费f=%f\n", f);
    return 0;
}