Library Functions

Library Functions

• To perform common task C language provide us many library functions.
• These functions are declared in different header files such as math.h, graphics.h, stdio.h, string.h etc
• If we want to use these functions in our program. Then we have to include the header file in our program by using the preprocessor command.

printf( )

• This function is used to print formatted string on standard output device.
• The function prints the string inside quotations.
• To use printf() in our program, we need to include stdio.h header file using the #include statement.

scanf()

• It scan the user input according to format string and stores it at specified memory addresses.
• '&' operator is use to find memory address of variable.

clrscr( )

• It is use to clear the screen.
• It is a predefined function in "conio.h" (console input output header file) used to clear the console screen.

getch()

• It is use to wait until a key is pressed.
• It is a predefined function in "conio.h" (console input output header file) will tell to the console wait for some time until a key is hit given after running of program.

Escape sequences

These are the special control characters which we can sent to our standard output device to perform different action.

#include<stdio.h>
main()
{
  printf("Welcome to C Programming");
  printf("\nAmravati");
  printf("\nCCIT");
}

Welcome to C programming
Amravati
CCIT