Answered Essay: Write a program that takes a word entered by the user, check if the word is a valid username. If the input is valid, prin

C – language

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) The user name 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, zone8 is valid and zone!8 is invalid

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.

Can you guys don’t use array – list for this problem?

This is mine so far:



int main()


int name;

int len = 0;

printf(“enter id: “);

name = getchar();

while (name != ‘n’)


len ++;

name = getchar();


printf(“len %dn”, len);

if (len < 5 || len > 10 || isspace(name) || ispunct(name))








return 0;


The issues of my program are in if – else statement! it did not work, it worked in about checking the len but the if-esle did not work. Please show me in more detail, I appreciate that!

Expert Answer


Note : As u mentioned that dont use array I developed the program like this.Could u plz check the output …I u need any changes just do comment…if not could u plz rate me well thank You.


#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

int main()
// Declaring variables
char c;
int len = 0;

// Read each character of the word
printf(“Enter Word: “);

// This loop continues to run until the user press enter.
while ((c = getchar()) != ‘n’)

/* checking whether the character is alphabet
* and digit and underscore or not
if (!isalpha(c) && !isdigit(c) && c != ‘_’)
printf(“** Username is Invalid **”);
// calculating the length of the word

// checking whether the user name is of valid length or not
if (len < 5 || len > 10)
printf(“** Username is Invalid **”);
printf(“** Username is valid **”);

return 0;



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