Advice for the new boy!

[CoCo]

Hello, I have written this program, forgive me , this is my first program after " hello world".

# include <stdio.h> /*  */
#include <stdlib.h> /*  */


int main(void)/* */

{

	int sum, char1, char2, char3, char4;/*  */
	
	printf( "Please enter four characters:\n"); /**/

	char1 = getchar();/**/
	char2 = getchar();/**/
	char3 = getchar();/**/
	char4 = getchar();/**/
	
    printf("The first character you entered is: %c,", char1 );/**/
    printf(" the ASCII value is %d.\n", char1 );
    printf("The second character you entered is: %c,", char2 );
    printf(" the ASCII value is %d.\n", char2 );
    printf("The third character you entered is: %c,", char3 );
    printf(" the ASCII value is %d.\n", char3 );
    printf("The fourth character you entered is: %c,", char4 );
    printf(" the ASCIIV value is %d.\n", char4 );

    sum = char1 + char2 + char3 +char4;
    printf("The sum of the ASCII values = %d\n",sum);
    
    system("pause");/**/
    
  

}

How can i make the program display an error message if the user enters more than four characters?
Also any feedback on how I can improve the program?

[Bayint Naung]

Aren't new boys supposed to read this.

[ಠ_ಠ]

you can improve your program by replacing the 4 char variables with a character array
you can improve the advice you get here by using [code] tags when posting code
to check if they entered more than 4 characters, read in a 5th, think about what it should equal, and then check if it does equal that
also, learn to properly document your code, it will save you hours of trouble when you start writing more complicated programs