Which outputs a single character on the screen

#include<stdio.h>
#include<conio.h>
void main()
{
clrscr();
putchar('A');
getch();
}

Which reads one (and only one) character from the keyboard

#include<stdio.h>
#include<conio.h>
void main()
{
char ch;
clrscr();
printf("Enter any character=");
ch=getchar();
printf("%c",ch);
getch();
}