#include <stdio.h>
#include <stdlib.h>

int words_number(char *mass, int n) {
    int number = 0;
    for (int i = 0; i < n; i++)
        if (*(mass + i) = ' ')
            number++;

    return number;

}

int main()
{

    char mass[256];
    int n = 0, i = 0, m = 0;
    printf("Введите строку\n");
    gets_s(mass);
    while (mass[i] != '\0') {
        n++;
        i++;
    }
    m = words_number(mass, n);
    printf("%d", m);
    system("pause");
    return 0;

}