#include<stdio.h>
#include<stdlib.h>

int main(int argc, char **argv) {
  printf("argc: %d\n", argc);
  for(int i = 0; i < argc; ++i) {
    printf("argv[%d]: %s\n", i, argv[i]);
  }
  if (argc <= 1)
    exit(1);
  printf("hello, world!\n");
  fprintf(stderr, "hello, error stream!\n");
  exit(100);
}