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;}