C Unformatted Functions

Unformatted input and output functions are only work with character data type. Unformatted input and output functions do not require any format specifiers. Because they only work with character data type.

Character IO Functions

getchar() Function

The getchar() function reads character type data form the input. The getchar() function reads one character at a time till the user presses the enter key.

getchar() C Program

#include <stdio.h> //header file section
#include <conio.h>
int main()
{
char c;
printf("Enter a character : ");
c = getchar();
printf("\nEntered character : %c ", c);
return 0;
}

getch() Function

The getch() function reads the alphanumeric character input from the user. But, that the entered character will not be displayed.

getch() C Program

#include <stdio.h> //header file section
#include <conio.h>
int main()
{
printf("\nHello, press any alphanumeric character to exit ");
getch();
return 0;
}

getche() Function

getche() function reads the alphanumeric character from the user input. Here, character you entered will be echoed to the user until he/she presses any key.

getche() C Program

#include <stdio.h> //header file section
#include <conio.h>
int main()
{
printf("\nHello, press any alphanumeric character or symbol to exit \n ");
getche();
return 0;
}

putchar() Function

putchar() function prints only one character at a time.

putchar() C Program

#include <stdio.h> //header file section
#include <conio.h>
int main()
{
char c = 'K';
putchar(c);
return 0;
}

putch() Function

The putch() function prints any alphanumeric character.

putch() C Program

#include <stdio.h> //header file section
#include <conio.h>
int main()
{
char c;
printf("Press any key to continue\n ");
c = getch();
printf("input : ");
putch(c);
return 0;
}

String IO Functions

gets() Function

The gets() function can read a full string even blank spaces presents in a string. But, the scanf() function leave a string after blank space space is detected. The gets() function is used to get any string from the user.

gets() C Program

#include <stdio.h> //header file section
#include <conio.h>
int main()
{
char c[25];
printf("Enter a string : ");
gets(c);
printf("\n%s is awesome ",c);
return 0;
}

puts() Function

The puts() function prints the charater array or string on the console. The puts() function is similar to printf() function, but we cannot print other than characters using puts() function.

puts() C Program

#include <stdio.h> //header file section
#include <conio.h>
int main()
{
char c[25];
printf("Enter your Name : ");
gets(c);
puts(c);
return 0;
}

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