#include "stdio.h"
main()
{
    int a,b,c,d;                                    
    printf("请输入");                           
    scanf("%d,%d,%d",&a,&b,&c);            
    d=max(a,b,c)
    printf("%d",d);
}
int max(a,b,c)
int a,b,c;
{   int d;
    if(a>b)
        if(c>a)
            d=c;
    else  
        if(b>c) d=b;
      else
        d=a;
    return d;
}
   

请大虾们帮忙看一下

if (a > b)
    if (a > c)
        max = a;
    else
        max = c;
else if (b > c)
    max = b;
else
    max = c;

谢谢