Which of these is not a factor to consider when upgrading software? is the new upgrade stable? do you use the software frequently enough? what patches are applied to your current version? is the upgrade sufficiently different?

When is it appropriate to use an absolute reference

Write a program that prompts the user to input a string. the program then uses the function substr to remove all the vowels from the string. for example, if str = "there", then after removing all the vowels, str = "thr". after removing all the vowels, output the string. your program must contain a function to remove all the vowels and a function to determine whether a character is a vowel.

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