(Swap case) Rewrite the swapCase function in Programming Exercise to obtain a new string s...

(Swap case) Rewrite the swapCase function in Programming Exercise to obtain a new string s2 in which the uppercase letters are changed to lowercase and lowercase to uppercase in s1 using the following function header:

void swapCase(const char s1[], char s2[])

Write a test program that prompts the user to enter a string and invokes this function, and displays the new string. The sample run is the same as in Programming Exercise.

Programming Exercise (Swap case) Write the following function that returns a new string in which the uppercase letters are changed to lowercase and lowercase to uppercase.

string swapCase(const string& s)

Write a test program that prompts the user to enter a string and invokes this function, and displays the return value from this function. Here is a sample run: