char X[4];
int x = 0 , y = 0;
printf("请输入X值:");
scanf("%s",X);
x = atoi((char *)X);
if(x < 1)
y = x;
else if(x < 10 && x >= 1)
y = (2 * x - 1);
else if(x >= 10)
y = 3 * x - 11;
printf("Y的值为：%d\n",y);