C Reference Convert to lower case: tolower()

The function tolower() returns a lowercase character of the character that is put in.

tolower() source code example:


#include<stdio.h>
#include<ctype.h>

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

	while (str[counter])
	{
		mychar=str[counter];
		putchar (tolower(mychar));
		counter++;
	}
	return 0;
}

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

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