调用函数，求最大值

#include<stdio.h> 
#include<string.h>
int main() {
  int a = 0;
  int b = 0;
  int z = 0;
  scanf("%d %d", &a, &b);
  z = max(a, b);
  
  printf("%d\n", z);
  return 0;
}
 int max(int x, int y) {
  while (x >= y) {
    
    return x;

  }
  return y;
}