Dev - C++ - Cadena de caracteres al revés

#include <stdio.h>

#include <string.h>

int main ()

{

	int Y=0,X=0;

	char Z[50];

	printf("Digite las palabras\n");

	gets(Z);

	while(Z[X] != '\0')

	{

		printf("%c",Z[X]);

		X++;

	}

	printf("\nLa palabra invertida es: %s", strrev(Z));

}

#include <stdio.h>

int main()

{

    char cad[50];

    int k = 0, j;

    printf("\nCadena:\n");

    scanf("%49[^\n]", cad);

    printf("\n");

    while (cad[k] != '\0')

        k++;

    for (int i = k - 1 ; i >= 0; i--)

    {

        if (cad[i] == ' ' || i == 0)

        {

            j = i == 0 ? i : i + 1;

            while (cad[j] != ' ' && j < k)

                printf("%c", cad[j++]);

            printf(" ");

        }

    }

    printf("\n");

    return 0;

}