split string into array C++

Question

How do I split an input string using getline(cin, input); to input the variable? I want to split it into a char array like this:

char[] = { // What goes here to make it read the input variable and split it into chars }

Is there any way to do this?

And what about y'all's new posts? Which one is best? Here is the caesar cipher code I need to modify to read the input variable and store its chars in a char array:

// Test Code ONLY
// Not A Commercial Program OR A Crypter
// THIS IS A TEXT CIPHERER

#include <windows.h>
#include <cstdlib>
#include <iostream>
#include <string.h>
#include <vector>

using namespace std;

int main()

{
    string in;
    string out;
    char lower[25] = {a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z};
    char upper[25] = {A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z};
    char upcip[25] = {Z,Y,X,W,V,U,T,S,R,Q,P,O,N,M,L,K,J,I,H,G,F,E,D,C,B,A};
    char locip[25] = {z,y,x,w,v,u,t,s,r,q,p,o,n,m,l,k,j,i,h,g,f,e,d,c,b,a};
    cout << "Enter PlainText: ";
    getline(cin, in);
    // which sample goes here to read the input var char by char, then store the chars in order in a char array in your opinion?
    return 0;
}

Why do you need this? `std::string::c_str()` will return a pointer to a null-terminated char array. — jrok, Sep 13 '12 at 12:26
possible duplicate of [How do I tokenize a string in C++?](http://stackoverflow.com/questions/53849/how-do-i-tokenize-a-string-in-c) — Bo Persson, Sep 13 '12 at 12:36

score 4 · Answer 1 · answered Sep 13 '12 at 12:28

4

A string is already an array of chars:

for (std::string line; std::getline(std::cin, line); )
{
    for (std::size_t i = 0, e = line.size(); i != e; ++i)
    {
        std::cout << "char[" << i << "] = '" << line[i] << "'\n";
    }
}

answered Sep 13 '12 at 12:28

Kerrek SB

464,522
92
875
1,084

spin_eight · Answer 2 · 2012-09-13T15:04:00.013

0

string str;
    std::getline(cin,str);
    char* pArr = new char[str.size() + 1]; // add 1 for zero element which is the end of string
    strcpy(pArr,str.c_str());

/*
some actions with pArr, for ex.
while(*pArr)
    std::cout << *pArr; // output string on the screen

*/

// updated: release memory obtained from heap
delete [] pArr;

edited Sep 13 '12 at 15:04

answered Sep 13 '12 at 12:32

spin_eight

3,925
10
39
61

Don't forget to delete the array once you're done with it. And for exception safety, it really should be managed by some kind of RAII type, such as `std::string`. – Mike Seymour Sep 13 '12 at 13:24

split string into array C++

2 Answers2