text: //
  // Created by zhangrongxiang on 2017/10/13 12:42
  // File sum
  //
  
  #ifndef LEARN_C_SUM_H
  #define LEARN_C_SUM_H
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  
  int sum(int *x, int *y);
  
  #endif //LEARN_C_SUM_H
  