The C programming language provides many standard library functions for file input and output. These functions make up the C standard library header <stdio.h>. The system finds the file name stdio.h and reads its entire contents in, replacing the statement. List of inbuilt C functions in stdio.h file are: printf ( ) - This function is used to print the character, string, float, integer, octal and hexadecimal values onto the output screen. scanf ( ) - This function is used to read a character, string, numeric data from a keyboard. getc ( ) - It reads characters from a file. getchar( ) - It reads characters from the keyboard. puts ( ) - It writes lines to the output screen.
