#include <stdio.h>
#include <stdlib.h>
#define TEN 10
int max()
{
    int a[TEN];
    int i,j;
    printf("INPUT 10 numbers\n");
    while (1)
    {
        j=0;

        for (i=0;i<10;i++)
        {
            scanf("%d",&a[i]);
            if (a[i]<=0)
            {
                printf("error!\n");
                break;
            }
            else if (a[i]>0)
            {
                if (a[i]>a[0])
                    a[0]=a[i];
            }
        }
        j++;
        if (j>0&&i==10)
            break;
    }
    return a[0];
}
int main()
{
    printf("the max is %d",max());
    return 0;
}
输入十个正数，0和负数报错，可是我输入零就又要重新输入10个
怎么解决，谢谢

自定义函数名不可以，换个！

输入0break只能跳出for循环，若要跳出while循环可把  
      if (j>0&&i==10)   break;
改为        if (j>0&&i==10||a[i] == 0) break;

改了哈！

#include <stdio.h>
#include <stdlib.h>
#define TEN 10
int max()
{
    int a[TEN];
    int i,j,t=0;
    printf("INPUT 10 numbers\n");
    while (1)
    {
        j=0;

        for (i=0;i<10;i++)
        {
            scanf("%d",&a[i]);
            if (a[i]<=0)
            {
                t=i;
                printf("error!\n");
                break;
            }
            else if (a[i]>0)
            {
                if (a[i]>a[0])
                    a[0]=a[i];
            }
        }
        j++;
        if (j>0&&i==10)
            break;
    }
    return a[0];
}
int main()
{
    printf("the max is %d",max());
    return 0;
}