2、計(jì)算機(jī)的if 改為 switch

int x,y;
scanf("%d",&x);
if(x<5) {
    y=x;
    printf("x=%d, y=x %d\n",x,y);
} else if(x<10) {
    y=2*x-1;
    printf("x=%d, y=2*x-1 %d\n",x,y);
} else {
    y=3*x-11;
    printf("x=%d, y=3*x-11 %d\n",x,y);
}

改成

#include <stdio.h>
int main(void) {
    int x, y;
    int c;
    scanf("%d", &x);
    c=(x<5)*1+(x>=5&&x<10)*2+(x>=10)*3;
    switch(c) {
    case 1:
        y = x;
        printf("x=%d, y=x = %d\n",x,y);
        break;
    case 2:
        y = 2*x-1;
        printf("x=%d, y=2*x-1 = %d\n",x,y);
        break;
    case 3:
        y = 3*x-11;
        printf("x=%d, y=3*x-11 = %d\n",x,y);
        break;
    }
    return 0;
}

批改老師：PHPz

批改狀態(tài)：合格

老師批語：switch中，把+、-、*、/、%是否更加直觀，不易犯錯(cuò)