C语言用max函数比较两个数的大小

#include<stdio.h>

int Max(int x, int y)//声明函数max

{

if (x >y)

 return x;

else

 return y;

}

int main()

int num1 = 10;

int num2 = 20;

int max = 0;

max = Max(num1, num2);