// tolower example 
// source: http://www.cplusplus.com/

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

int main()
{
  int i=0;
  char str[]="Dartmouth Computer Scienece CS50\n";
  char c;
  fprintf(stdout, "%s\n", str);
  while (str[i])
    {
      c=str[i];
      putchar(tolower(c));
      i++;
    }
  return 0;
}