求两个书中的最大数

#include<stdio.h>int max(int x,int y){int z;if(x>y){z = x;}else{z = y;}//z = x > y ? x : y;return z;}int main(){int max(int x,int y);int a,b,c;scanf("%d,%d",&a,&b);c = max(a,b);printf("max is: %d\n",c);return 0;}