#include <stdio.h>
#include <string.h>

int fnWords(const char *sentence) {
    int iCount = 0, i, iLen;
    char lastC;
    iLen = strlen(sentence);
    if(iLen > 0) {
        lastC = sentence[0];
    }
    for(i = 0 ; i <= iLen ; i++) {
        if((sentence[i] == ' ' || sentence[i] == '\0') && lastC != ' ') {
            iCount++;
        }
        lastC = sentence[i];
    }
    return iCount;
}

int main() {
    const char *string = "Please, write the following message: !!!Error!!!Program will be terminated! ";
    printf("Words = %i\n", fnWords(string));
    return 0;
}