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You have a variable, letter, that contains a character entered by the user. You want a program that will change it to uppercase if it
You have a variable, letter, that contains a character entered by the user. You want a program that will change it to uppercase if it is lowercase, and to lowercase if it is uppercase. Complete the code so th will achieve your goal without using isupper, islower, tolower, or toupper. if ( letter
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