C Reference Convert to upper case: toupper()

The function toupper() returns a uppercase character of the character that is put in.

toupper() source code example:


int main()
	int counter=0;
	char mychar;
	char str[]="TeSt THis seNTeNce.\n";

	while (str[counter])
		putchar (toupper(mychar));
	return 0;

Note: the sentence will be converted to all uppercase letters.

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