Reversed Sentence( by words ) 01

// Cpp program to get the reversed version of a sentence [reversed by words]
// created on June/July, 2016
// Author: fueanta

#include <iostream>
#include <conio.h>
using namespace std;

int total_words(string);
string get_words(string &st);

int main(void) {
    string str1,str2,str3;
    cout << "Given String: ";
    getline(cin,str1);
    int words= total_words(str1);
    cout << "Total Words: " << words << endl;
    string st[words]; str2=str1;
    for (int i=(words-1);i>=0;i--) {
        st[i]= get_words(str2);
    }
    for (int i=0;i<words;i++) {
        str3+=(st[i]+" ");
    }
    cout << "Reversed String: " << str3 << endl;
    getch();
    return 0;
}

int total_words(string st) {
    int counta=0;
    for(int i=0; st[i] ;i++) {
        if(st[i]==' ')
            counta++;
    }
    if ((st[0]!='\0') || (st[0]!=' '))
        counta++;
    return counta;
}

string get_words(string &st) {
    string str; int i=0;
    while (st[i]) {
        if (st[i]!= ' ') {
            str+=st[i];
            st.erase(i,1);
        }
        if (st[i]== ' ') {
            st.erase(i,1);
            break;
        }
    }
    return str;
}