Non-formatted Input and Output functions:

These are console Input Output Library functions that deal with one character at a time and string function for an array of characters (string). Unformatted I/O functions work only with character datatype (char).

Unformatted Input functions used in C are as follows:

getch() 

It accepts only a single character from the keyboard. The character entered through getch() is not displayed on the screen (monitor).

Syntax for getch () in C :

char d=getch();

getche()

Like getch(), getche() also accepts only single character, but unlike getch(), getche() displays the entered character on the screen.

Syntax for getche() in C :

d=getche();

getchar()

It accepts only one character type data from the keyboard.

Syntax for getchar() in C :

d=getchar();

gets()

Accepts any line of a string including spaces from the standard Input device (keyboard). This stops reading characters from the keyboard only when the enter key is pressed.

Syntax for gets() in C :

gets(s)

Unformatted Output functions used in C are as follows:

putch

It displays any alphanumeric characters to the standard output device but displays only one character at a time.

Syntax for putch in C :

putch(c );

putchar

This displays one character at a time to the monitor.

Syntax for putchar in C :

putchar(c);

puts

It displays a single / paragraph of text to the standard output device.

Syntax for puts in C :

puts(s);