#include<stdio.h>
void main()
{
    int outmancount=0,index=0,counter=0;
    int persons[10][2],i;
    for(i=0;i<10;i++)
    {
        persons[i][0]=i;
        persons[i][1]=1;
    }
    while(outmancount<10)
    {
        if(persons[index%10][1])
        {counter++;
        if(counter%7==0)
        {
            persons[index%10][1]=1;
            outmancount++;
            printf("%3d",persons[index%10][0]);
        }
        
        
        }
        index++;
    }
    printf("\n");
}这是一道练习题   具体过程不太明白  请大神们给个详细回复。