新人求助!习题.老是输出不了.
if(number>500)cost=0.15;
else if(number>300)cost=0.10;
else if(number>100)cost=0.075;
else if(number>50)cost=0.05;
else cost=0;

[解决办法]
#include <stdio.h>

void main(void)
{
int number = 0;
double cost = 0.0;
scanf("%d", &number);
if(number>500)
cost=0.15;
else if(number>300)
cost=0.10;
else if(number>100)
cost=0.075;
else if(number>50)
cost=0.05;
else cost=0;
printf("%f\n", cost);
}