用C语言，如何编写此程序？（刚学过循环语句…）

#include <stdio.h>
int main()
{
    int mouth,day,i,n;
    printf("请输入本年1月1日是星期几(星期日请输入7):");
    scanf("%d",&n);
    while(1)
    {
        day=n;
    printf("请输入要查看的月份:");
    scanf("%d",&mouth);
switch (mouth)
{
        case 1:break;
        case 2:if(day<=4)day+=3;else day-=4;break;
        case 3:if(day<=4)day+=3;else day-=4;break;
        case 4:if(day<=1)day+=6;else day-=1;break;
        case 5:if(day<=6)day+=1;else day-=6;break;
        case 6:if(day<=3)day+=4;else day-=3;break;
        case 7:if(day<=1)day+=6;else day-=1;break;
        case 8:if(day<=5)day+=2;else day-=5;break;
        case 9:if(day<=2)day+=5;else day-=2;break;
        case 10:break;
        case 11:if(day<=4)day+=3;else day-=4;break;
        case 12:if(day<=2)day+=5;else day-=2;break;
    }
    printf("MON TUE WED  THU  FRI  SAT  SUN\n");
    if(mouth==1||mouth==3||mouth==5||mouth==7||mouth==8||mouth==10||mouth==12)
    {
        for(i=0;i<day+30;i++)
        {
            if(i<day-1)
                printf("     ");
            else
                printf("%-5d",i-day+2);
            if((i+1)%7==0)
                printf("\n");
        }
        printf("\n");
    }
    else if(mouth==2)
    {
        
        for(i=0;i<day+27;i++)
        {
            if(i<day-1)
                printf("     ");
            else
                printf("%-5d",i-day+2);
            if((i+1)%7==0)
                printf("\n");
        }
        printf("\n");
    }
    else
    {
        
        for(i=0;i<day+29;i++)
        {
            if(i<day-1)
                printf("     ");
            else
                printf("%-5d",i-day+2);
            if((i+1)%7==0)
                printf("\n");
        }
        printf("\n");
    }
}
    return 0;
}

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好的好的谢谢~

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