Using the standard input, the user enters 1 letter. If its a valid lower-case letter, then the program prints out the upper-case version.
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Using the standard input, the user enters 1 letter. If its a valid lower-case letter, then the program prints out the upper-case version.
You could use
toupper. If you need to check to see if the input character is lower case first, you can useislowerto test it.