#include main() { int x; scanf("%d",x-5); if(x>15)printf("%d",x-5); if(x>10)printf("%d",

#include main() { int x; scanf("%d",x-5); if(x>15)printf("%d",x-5); if(x>10)printf("%d",

scanf()用法错误
应该是
scanf("%d", &x); //输入一个数字并赋值给变量x