无法解析的外部符号 "int __cdecl max(int,int)" (?max@@YAHHH@Z)，函数 main 中引用了该符号

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int 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);
    


}

 
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int max(int x, int y)//
{
    if(x>y) return x;
    else return y;
    
}

int 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);
}