2- Write a C++ function that returns how many digits in a string. For example, if you enter "This is an easy quiz, and I should get 10 out of 10", the function returns 4. Write a C++ program to test...

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Extracted text: 2- Write a C++ function that returns how many digits in a string. For example, if you enter "This is an easy quiz, and I should get 10 out of 10", the function returns 4. Write a C++ program to test your function. Prevent the user from changing the string inside the function.