a,b,c max?

#include<stdio.h>
void main()
{
int max(int x,int y);
int a,b,c;
scanf("%d,%d",&a,&b);
c=max(a,b);
printf("max=%d\n",c);
}
int max(int x,int y)
{
int z;
if(x>y)z=x;
else z=y;
return(z);
}