strtok

[Windwhistles]

#include <iostream>
#include <cstring>
using namespace std;

int main()
{
    string new_sentence;
    char sentence[100],*p;      
    cout<<"Write a sentence.\n";
    cin.getline(sentence,99);       
    p=strtok(sentence," ");         
    while(p!=NULL){                 
    if(p=="a"){
    new_sentence+="a";
    }
    p=strtok(NULL," ");
    }
    
    cout<<new_sentence<<endl;
    
    cout<<"Press ENTER to end the program.  ";
    cin.get();
    return 0;
}

In this program even when p is "a", new_sentence does not change.

Thanks.

[Peter87]

To compare two c strings you use std::strcmp.
If you prefer you can convert one of the c strings to std::string and use ==.

[Windwhistles]

How did I forget! Thanks again Peter87.