编辑代码

#include<stdio.h>

int Maxnum(int a, int b){
    if(a > b) return a;
    else return b;
}

int main(){
    int n, max;
    scanf("%d", &n);
    if(n != -1){
        max = n;
        while(n != -1){
            max = Maxnum(max, n);
            scanf("%d", &n);//这句必须在末尾
        }
        printf("%d", max);
    }
    
    return 0;
}