Programming Project 10

For this project you are to code two functions that accept C-string parameters.

bool allDigits(char str[])

This function accepts a C-string parameter (null-terminated char array) and

return true if the C-string contains only digits. The function is to return false if

the C-string contains any other character.

char *firstNonDigit(char str[])

This function accepts a C-string parameter and returns a pointer to the first non-

digit that occurs in the string. If the string contains only digits, the function is to

return the value null.

The main function for this project is to follow the indicated algorithm:

Repeat

Prompt for an int, read it into a Cstring

If the string contains any illegal (non-digit) characters

Print out an error message that contains the first non-digit of the input

Until a valid string (all digits) is entered

Convert the C-string to an int (the atoi function in the cstdlib library is

handy here)

Print out the int that was input, and also twice that value

** You may find the cctype library, as discussed in Section 8.5 helpful in determining if a character is a digit. Alternatively, a digit is simply a character within the range 0 9.