If an uppercase character is passed as an argument to toupper, the result will be an uppercase character.

Name: If an uppercase character is passed as an argument to toupper, the result will be an uppercase character.
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The toupper function in C/C++ is used to convert a lowercase character to uppercase. If an uppercase character is passed as an argument, it will retain its uppercase status and toupper will not change it.

If an Uppercase Character Is Passed as an Argument to Toupper