#include<stdio.h>
float main()
{
    int type;
    float time,salay,number,piece,fix_wages,wages;            //定义工作时间、计时工资、产品件数、计件薪水、固定工资、应发工资//
    float tax,tax_dues,actual_wages;                        //定义交税工资、个人所得税、实际工资//
    printf("请输入工资类型：\n");
    scanf("%f",&type);
    switch(type)
    {
    case 1:{
            printf("请输入工作时间及每小时的薪水:\n");
            scanf("%f%f",&time,&salay);
            wages=time*salay;
            break;
           }
    case 2:{
            printf("请输入完成产品件数和每件薪水:\n");
            scanf("%f%f",&number,&piece);
            wages=number*piece;
            break;
           }
    case 3:{
            printf("请输入每月固定的应发工资:\n");
            scanf("%f",&fix_wages);
            wages=fix_wages;
            break;
           }
    }
    tax=wages-2000;
    if(tax<=0)
        tax_dues=0;
        else if(tax<=500)
                tax_dues=tax*0.05;
            else if(tax<=2000)
                    tax_dues=(500*0.05)+(tax-500)*0.1;
                else if(tax>2000)
                        tax_dues=(500*0.05)+(1500*0.1)+(tax-2000)*0.15;
    actual_wages=wages-tax_dues;
    printf("wages=%6.2f,tax_dues=%6.2f,actual_wages=%6.2f\n",wages,tax_dues,actual_wages);
}


为什么输出结果是乱的？

谢谢！
以后写程序的时候一定要注意细节。