#include"stdio.h"
#include"math.h"
void main()
{
    double profit,bonus;
    scanf("%f",&profit);
    if(profit<=0)
    {
        printf("今年没有奖金！\n");
    }
    else
    {
        if(profit<=10)
        {
            bonus=profit*10.0/100;
        }
        else if(profit<=20)
        {
            bonus=10*10.0/100+(profit-10)*7.5/100;
        }
        else if(profit<=40)
        {
            bonus=10*10.0/100+10*7.5/100+(profit-20)*5.0/100;
        }
        else if(profit<=60)
        {
            bonus=10*10.0/100+10*7.5/100+20*5.0/100+(profit-40)*3.0/100;
        }
        else if(profit<=100)
        {
            bonus=10*10.0/100+10*7.5/100+20*5.0/100+20*3.0/100+(profit-60)*1.5/100;
        }
        else
        {
            bonus=10*10.0/100+10*7.5/100+20*5.0/100+20*3.0/100+40*1.5/100+(profit-100)*1.0/100;
        }

        printf("今年的奖金是%g\n",bonus);

    }
}

是否是这样的：
%f对应float；
%lf对应double;
%g只能对应float；