Answered Essay: PLEASE TYPE IN C PROGRAMMING

PLEASE TYPE IN C PROGRAMMING

2. You are creating a new account on a website and need to come up with a username.

The username has the following requirement:

1) The username has at least 5 characters, and at most 10 characters

2) It must contain alphabetic letters (upper or lower case), digit or underscore, but no space or other punctuations. For example, mike_FL is valid and mike!FL is invalid Write a program that takes a word entered by the user, check if the word is a valid username. If the input is valid, print a confirmation statement. If it is not, print a statement that the input is not valid.

1) Name your program username.c.

2) The user input ends with the user pressing the enter key (a new line character).

3) Use getchar() to read in the input.

4) You can use character handling functions such as isdigit and isalpha. Don’t forget to include ctype.h if you use any character handling functions.

Expert Answer

 

Program Screenshots:

Sample Output 1:

Sample Output 2:

Code to Copy:

//Use “stdafx.h” only, if using visual studio.
#include “stdafx.h”

//Include the necessary header files
#include <stdio.h>
#include <ctype.h>

//Start the main
int main()
{

//Declare the variables
int i= 0;
int notValid = 0;
char c;

//Prompt the user to enter the name.
printf(“Enter name: n”);

//Start the while loop
while(1)
{

// Input the character
c = getchar();

// check whether character is newline
// or not.
if(c == ‘n’)
break;

//check whether there are
// more than 10 characters or not
if(i > 10)
break;

// Check whether the digits, characters
//are valid or not
if(isdigit(c)|| isalpha(c) || (c == ‘_’))

// Update the value of i.
i++;

// Update the value of notValid.
else
{
notValid = 1;
break;
}
}

// Check whether the input name is
// valid or not
if(i < 5 || i > 10 || notValid)

//Display the statement
printf(“The input is not validn”);

else

// Display the statement
printf(“The input is validn”);

//Use system(pause) only, if using visual studio.
system(“pause”);

return 0;

}

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