int getchar ( void );int putchar ( int character );——stdio.h

/* getchar example : typewriter */
#include <stdio.h>

int main ()
{
  char c;
  puts ("Enter text. Include a dot ('.') in a sentence to exit:");
  do {
    c=getchar();
    putchar (c);
  } while (c != '.');
  return 0;
}

/* putchar example: printing alphabet */
#include <stdio.h>

int main ()
{
  char c;
  for (c = 'A' ; c <= 'Z' ; c++) {
    putchar (c);
    }
  return 0;
}