大家帮我看看我的程序哪里错了，为什么当输入大于1000后，就不能正常运算了呢？
#include<stdio.h>

int main()
{

int porfit, sum;
printf("Please input porfit:");
scanf("%d",&porfit);

if (porfit<=1000)
printf("you will get:$%d\n",500);
else{
if(porfit>1000&&porfit<=2000)
printf("you will get:$%d\n",500+porfit*0.1);
else{
if(2000<porfit<=5000)
printf("you will ger:$%d\n",500+porfit*.15);
else{
if(5000<porfit<=10000)
printf("you will get:$%d\n",500+porfit*.2);
else{
if(porfit>=10000)
printf("you will get:$%d\n",500+porfit*.25);
} }}}

}

当整数与浮点数相运算时会自动把整数转换成浮点数, 又因为是以十进制输出,所以为0.

#include<stdio.h>

int main()
{

int porfit, sum;
printf("Please input porfit:");
scanf("%d",&porfit);

if (porfit<=1000)
printf("you will get:$%d\n",500);
else{
if(porfit>1000&&porfit<=2000)
printf("you will get:$%d\n",500+int(porfit*0.1));
else{
if(2000<porfit<=5000)
printf("you will ger:$%d\n",500+int(porfit*.15));
else{
if(5000<porfit<=10000)
printf("you will get:$%d\n",500+int(porfit*.2));
else{
if(porfit>=10000)
printf("you will get:$%d\n",500+int(porfit*.25));
} }}}

}

用sum=500+porfit*0.1;或
(int)(500+porfit*0.1)试试。。
Please input porfit:1200
you will get:620
Press any key to continue...