gistfile1.c

#include <stdio.h>

#define TEST(a, b, mustBe) \
  if(mustBe != getWordLength(a, b)) { printf("Error > "); } \
	printf("\"%s\" word with index %d has length %d, must be %d\n", a, b, getWordLength(a, b), mustBe);

//Функция определяет длину слова с заданным номером
//0 если слово не нашлось

int getWordLength(char* sentence, int index)
{
	int i = 0, j = 0;
	int startWord = 0;

	for (; ; ++i)
	{
		if(sentence[i] == ' ' || sentence[i] == '\0')
		{
			if(index == j)
				return i - startWord;

			startWord = i + 1;
			++j;
		}

		if(sentence[i] == '\0')
			return 0;
	}

	return 0;
}

int main(void)
{
	TEST("I am Varya", 1, 2);
	TEST("I am best of the best", 4, 3);
	TEST("I am best of the best", 15, 0);
	TEST("I am best of the best", 5, 4);

	return 0;
}