#include<stdio.h>int main(){int Y,X;int Switch;printf("please enter X:");scanf("%d",&X);if(X<1){Switch=1;}else if(1<=X&&X<10){Switch=2;} else{Switch=3;}switch(Switch){case 1:break;case 2:Y=2*X-1;break;case 3:Y=3*X-11;break;default:break;}printf("Y is:%d\n",Y);return 0;}感謝您的回答！