怎样求三个数的最大值?要是c语言的!

#include
main()
{
int a,b,c;
scanf("%d,%d,%d",&a,&b,&c);
if((a>b)&&(a>c))
printf("the max is:%d",a);
else if((b>a)&&(b>c))
printf("the max is:%d",b);
else
printf("the max is:%d",c);
}