C

stdio.h in c

//This is an example of stdio.h in C programming.
#include<stdio.h>

int main () {
   char val;

   printf("Enter the character: 
");
   val = getc(stdin);
   printf("Character entered: ");
   putc(val, stdout);

   return(0);
}

stdio.h

// It stands for "standard input-output" header, a C standard library.
// These are it's 4 most used functions:
	printf(); // Function used to show data on screen.

	scanf(); // Function used to get data from user.

	fprintf(); // Function used to press data in a file.

	fscanf(); // Function used to read data from a file.

// Discover more: https://en.wikipedia.org/wiki/C_file_input/output