万年历在打印输出的时候怎么才能做到两月一行

#include <stdio.h>

int year(int y)
{
    if ((y%4==0) && (y%100!=0) || y%400==0)
        return 366;
    else
        return 365;
}

int main()
{
    int y;
    int i,j,sum=0,t=0;
    int begin,week;
    int days[12]={31,28,31,30,31,30,31,31,30,31,30,31};

    scanf("%d",&y);
    for(i=1;i<y;i++)
        sum+=year(i);

    week=(sum+1)%7;     //表示该年1月1日为星期几

    if(year(y)==366)
        days[1]=29;

    printf("\n%d年日历如下：\n\n",y);

    for(i=0;i<12;i++)
    {
        printf("       %d月            \n",i+1);
        printf("  7  1  2  3  4  5  6  \n");
        printf("=======================\n");
        begin=1;
        for(j=0;j<week;j++)
            printf("   ");
        while(begin<=days[i])
        {
            printf("%3d",begin);
            begin++;
            week=(week+1)%7;
            if(week%7==0)
                printf("\n");
        }
        printf("\n\n");

    }



    return 0;
}