#include <stdio.h>
#include <stdlib.h>
#define N 80
int FideMax(int score[],long num[],int n,long *pMaxNum);
int main()
{
    int n,i,score[N],j;
    long num[N],*Max=num;
    printf("input how many people:\n");
    scanf("%d",&n);
    printf("input grade and ID :\n");
    for(i=0;i<n;i++)
        scanf("%d%ld",&score[i],&num[i]);
    j=FideMax(score,num,n,Max);
    printf("MAx=%d ID=%ld",j,*Max);
    return 0;
}
int FideMax(int score[],long num[],int n,long *pMaxNum)
{
    int pos,i;
    pos=score[0];

    for(i=0;i<n;i++)
    {
        if(pos<score[i])
        {
            pos=score[i];
            pMaxNum=num+i;
            printf("%ld\n",*pMaxNum);
        }
    }
    return pos;
}

请问什么是in-out参数？