为什么我这段代码，输出不了 带th的 a 啊？ 求大神们帮帮我

Question

#include <stdio.h>int main(){        int a,b,c;        CW:printf("请输入日期(格式：日_月_年）:");        scanf("%d %d %d",&a,&b,&c);        if(a > 31 || a < 1 || b > 12 || b < 1)        {                printf("输入错误,");                goto CW;        }        else        {                switch(a)                {                        case 1: case 21: case 31:                                printf("%dst ",a);                                break;                        case 2: case 22:                                printf("%dnd ",a);                                break;                        case 3: case 23:                                printf("%drd ",a);                                break;                        defult:                                printf("%dth ",a);                                break;                }                switch(b)                {                        case 1:                                printf("January ");                                break;                        case 2:                                printf("February ");                                break;                        case 3:                                printf("March ");                                break;                        case 4:                                printf("April ");                                break;                        case 5:                                printf("May ");                                break;                        case 6:                                printf("June ");                                break;                        case 7:                                printf("July ");                                break;                        case 8:                                printf("August ");                                break;                        case 9:                                printf("September ");                                break;                        case 10:                                printf("October ");                                break;                        case 11:                                printf("November ");                                break;                        case 12:                                printf("December ");                }        }        printf("%d\n",c);        return 0;}

Answer 1

应该是判断出了出了问题，你把if语句中a和b的判断分开，分别判断试试。