When We Use Toupper in C#?

What is the toupper() function in C? In C, the toupper() function is used to convert lowercase alphabets to uppercase letters. When a lowercase alphabet is passed to the toupper() function it converts it to uppercase. When an uppercase alphabet is passed to the function it returns the same alphabet.

What is the use of toupper in C?

The toupper() function is used to convert lowercase alphabet to uppercase. i.e. If the character passed is a lowercase alphabet then the toupper() function converts a lowercase alphabet to an uppercase alphabet. It is defined in the ctype. h header file.

How do you use toupper?

The toupper() function converts the lowercase letter c to the corresponding uppercase letter. Both functions return the converted character. If the character c does not have a corresponding lowercase or uppercase character, the functions return c unchanged.