gistfile1.h

#include <stdio.h>
#include <stdlib.h>
 
int
main(int argc, char** argv) {
  char protein[4] = "ACGT";
  int size = atoi(argv[1]);
  int i = 0;
  int pos = 0;
  for(i; i < size; ++i) {
    pos = rand() % 4;
    printf("%c", protein[pos]);
  }
  return 0;
}