出现Debug error，用Switch写，怎么办

#include <stdio.h>
int main()
{
double s, i;
int c;
c = s / 10;
c = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10;
int f=1;
printf("请输入销售收入\n");
switch (c)
{
case 1: c <= 1, i = 0; break;
case 2: c <= 2, i = 0.01 * s; break;
case 3: c <= 4, i = 0.02 * s; break;
case 4:c <= 6, i = 0.04 * s; break;
case 5:c <= 10, i = 0.1 * s; break;
case 6:c > 10, i = 0.12 * s; break;
default:
break;
}
printf("收入为%.3lf，奖金为%.3lf\n", s, i);
printf("是否继续：是-1，否-0\n");
scanf("%d", &f);
getchar();
printf("是否继续：是-1，否-0\n");
scanf("%d", &f);

return 0;

}

c = s / 10;
你s的值呢，不是从键盘输入吗

代码太稀拉了，都没法改了。把题目贴出来吧