#include<stdio.h>
    int max4(int a,int b,int c,int d);
    int main(void)
{
    int a,b,c,d,max;
    printf("Please enter 4 number :\n");
    scanf("%d %d %d %d",&a,&b,&c,&d);
    max=max4(a,b,c,d);
    printf("Max=%d.\n",max);

    return 0;
}

   int max4(int a,int b,int c,int d)
    {
      int m;
      int max2(int a,int b);
      m=max2(a,b);
      m=max2(m,c);
      m=max2(m,d);

      return (m);
    }

    int max(int a,int b)
  {
     return (a>=b?a:b);
  }
哪里有错啊 请指点一二

Undefined symbols for architecture x86_64:
  "_max2", referenced from:
      _max4 in new10-nak1ps.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [new10] Error 1

Undefined symbols for architecture x86_64:
  "_max2", referenced from:
      _max4 in new10-nak1ps.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [new10] Error 1


这就是编译器说的  我看了好长时间 看不出来原因

jb 类  函数少打了一个2  我说类 。。。。。。



失误   此贴 沉了吧