Vezba 16

#include <stdio.h>

int duzina_stringa(char s[])
{
	int i = 0;
	while (s[i] != '\0')
	{
		i++;
	}
	return i;
}

char toUpperChar(char c)
{
	if (c >= 'a' && c <= 'z')
	{
		c = c - 'a' + 'A';
	}
	return c;
}

char toLowerChar(char c)
{
	if (c >= 'A' && c <= 'Z')
	{
		c = c - 'A' + 'a';
	}
	return c;
}

void toUpperString(char s[])
{
	int i = 0;
	while (s[i] != '\0')
	{
		s[i] = toUpperChar(s[i]);
		i++;
	}
}

void toLowerString(char s[])
{
	int i = 0;
	while (s[i] != '\0')
	{
		s[i] = toLowerChar(s[i]);
		i++;
	}
}
int main()
{
	char s[256];

	while (1)
	{
		gets(s);
		printf("%d \n", duzina_stringa(s));
		toUpperString(s);
		puts(s);
		toLowerString(s);
		puts(s);
		if (duzina_stringa(s) == 0)
			break;
	}

	return 0;
}