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你可以自己改下啊，用goto语句或加个while啊

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程序没有错，结果也是对的，建议加while。
不会截图，只能将运行结果贴出：
Enter date (mm/dd/yy): 01/22/10
Dated this 22th day of January,2010.

Enter date (mm/dd/yy): 7/9/14
Dated this 9th day of July,2014.

Enter date (mm/dd/yy):

#include<stdio.h>

main()
{
   
    int N,Y,R;
    int Flag=1;
    char x;
    while(Flag)
    {
        printf("请输入日期，yy/rr/nn\n");
        scanf("%d/%d/%d",&Y,&R,&N);   
        printf("Date this ");
        switch(R)
        {
        case 1:
            printf("%dst",R);
            break;
        case 2:
            printf("%dnd",R);
            break;
        default:
            printf("%dth",R);
            break;
        }   
        printf(" day of ");
        switch(Y)
        {
        case 1:
            printf("Jan");
            break;
        case 2:
            printf("Feb");
            break;
        case 3:
            printf("Mar");
            break;
        case 4:
            printf("Apr");
            break;
        case 5:
            printf("May");
            break;
        case 6:
            printf("Jun");
            break;
        case 7:
            printf("Jul");
            break;
        case '8':
            printf("Aug");
            break;
        case 9:
            printf("Sep");
            break;
        case 10:
            printf("Oct");
            break;
        case 11:
            printf("Nov");
            break;
        case 12:
            printf("Dec");
            break;
        default:
            printf("错误月份");
        }
        printf("    ,20%d\n",N);
        printf("是否重新输入Y/N：");
        do
        {
            getchar();
            scanf("%c",&x);               
            if(x==Y||x=='y')
            {
                Flag=1;
                break;
            }
            else
            {
                if(x=='N'||x=='n')
                {
                    Flag=0;
                    break;
                }
                else
                    printf("选择错误，请重新选择！\n");
            }
        }while(1);
    }
}

这个程序没有添加是否判断输入正确的功能，如果考虑的话，某一个月的日子，还有闰年都要计算，把一个月单纯的大于31的做法就是错误的，你有考虑2.29？4.31？……

void fun();
void main()
{
int i,n;
scanf("%d",&n);
for(i=0;i<n;i++)
fun();
}
将上面程序写入 void fun()中就可以多次调用了
也可以这样在主函数中使用循环如char c; c=getchar();while(c!='#') { 函数体   c=getchar()}也可多次调用