C言語の4番目の引数が気になったメモ

sample.c

#include<stdio.h>

int main(int argc, const char * argv[], char *envp[], char *apple[]){

  int i = 0;
  for (i = 0;  i < argc; i++) {
      printf("argv[%02d]: [%s]\n", i, argv[i]);
  }
  for (i = 0; envp[i] != NULL; i++) {
      printf("envp[%02d]: [%s]\n", i, envp[i]);
  }
  for (i = 0; apple[i] != NULL; i++) {
      printf("apple[%02d]: [%s]\n", i, apple[i]);
  }
  return 0;
}