4．以下4种水果1苹果2梨3桔子4芒果单价分别是20元公斤25元公斤30元公斤45元公斤请输入水果编号、重量计算应付款。用c语言程序

#include <stdio.h>

int main()
{
    int num; //水果编号
    float weight; //重量
    float price; //价格

    printf("请输入水果编号：\n");
    scanf("%d", &num);

    printf("请输入重量：\n");
    scanf("%f", &weight);

    switch(num)
    {
        case 1:
            price = 2.0 * weight;
            break;
        case 2:
            price = 2.5 * weight;
            break;
        case 3:
            price = 3.0 * weight;
            break;
        case 4:
            price = 4.5 * weight;
            break;
        default:
            printf("输入有误！\n");
            return 0;
    }

    printf("应付款：%.2f元\n", price);

    return 0;
}