从键盘上输入三个整数输出这三个整数的和平均值（保留两位小数）其最小值以及最大值

include <stdio.h>
int minmax(int a,int b,int flag)
{
    if(flag== 1)
    {
        if(a>b)
          return a;
        return b;
    }
    if(a<b)
        return a;
    return b;
}
int main()
{
    int a,b,c;
    float avg,sum=0;
    scanf("%d%d%d",&a,&b,&c);
    sum = a+b+c;
    avg = sum/3;
    printf("max=%d\n",minmax(minmax(a,b,1),c,1));
    printf("min=%d\n",minmax(minmax(a,b,0),c,0));
    printf("avg=%.2f\n",avg);
    return 0;
}