Need help with Zip Code Validator on C from Code Coach

Question

Something wrong with it, it passed every test case but one and I don’t know where bug is. Please help.

https://code.sololearn.com/cgl8zAofnpe2/?ref=app

Answer 1

Tim There are certain things you need to know about C language .
C doesn't go for bound checking i.e. It doesn't care about the length of your array and the length of your input.

So even if you have an array of length 5 but your input length is 6 , it will read 6 chars regardless of the size of array .

So to make sure, your code passes

Do
len=strlen(code)
If len>5 || len<5
print false

Answer 2

Hima it finally works. Thank you.

I knew the length was the case, but didn’t know how to manage that and make a proper length check.

Answer 3

little much help you ❤️

https://code.sololearn.com/c5MSGIbnD3h4/?ref=app

Answer 4

The code can be shortened by just defining a valid range.

If(code[i]>=48 && code[i]<=57)
{
//do your thing
}
and are you sure about the size of your array?

Answer 5

Hima what 48 and 57 mean? It works, thanks, but I don’t understand how.
Postal code needs to be 5 numbers in length, and if you use bigger size, it will show a different result.

Answer 6

Tim whenever you compare something, if the data type of both the operands are not same , the one which has lower rank gets converted into the higher one .
Here, int>char , and int value of a char is its ascii value .

e.g. '0' is 48 , '1' is 49 and so on.

Also , you said length of the postal code should be 6 but you have just taken 5 .
change it to 6

Answer 7

Hima I got it, thanks

Length is actually 5 (just edited), I accidentaly missclicked.

But still something is missing to complete the challenge

Answer 8

Tim Could you show me the problem statement?

Answer 9

Hima
As headmaster of the post office, sometimes people write zip codes that don't exist or zip codes that are not valid.
You are tasked with making a system to check if the inputted zip code is a valid zip code.

Task:
Write a program that takes in a string representing a zip code. Output true or false if it is a valid zip code or not.
A valid zip code is only numbers, must be 5 characters in length, and contain no spaces.

Input Format:
A string containing a zip code.

Output Format:
A string: true is the input is a valid zip code, or false, if it is not.

Sample Input:
752f78

Sample Output:
false

Explanation:
A valid zip code contains 5 digits, and no letters or spaces. The input is 6 characters long and contains letters, making it an invalid zip code.