Question

What is the difference between isupper() and toupper() functions?

Answer 1

isupper():

• This function is used to check the given character is uppercase.
• This function will return 1 if true otherwise 0.

toupper():

• This function is used to convert the given character into its uppercase.
• This function will return the upper case equivalent of the given character. If the given character itself is in the upper case, the output will be the same.