How to know if it is all numbers or not all numbers in 5 characters(length)?

Question

Sample output:

Enter character:12345
Valid length
All numbers

Enter character:123
Invalid length

Enter character:123x5
Valid length
Not all numbers

Answer 1

Test the length with strlen. Loop through the characters and test each for >= '0' and <= '9'.

Answer 2

I would agree with John Wells . I think that's the simplest way to do it. You can also use the character functions like 'isdigit()'

Answer 3

Take a look at the source code..

Answer 4

Okay, thank you I will try.