CODEWITHSUNDEEP
c++
venkysmarty
venkysmarty

Reputation: 11441

How to use cin for exit in C++

I have the following code from a book about Algorithms by Robert Sedwick.

How do i break a for loop in the following statement if (!(cin >> a[N])) break; 

#include <iostream>
#include <stdlib.h>
#include <string>

using namespace std;
int compare(const void *i, const void *j)
  { return strcmp(*(char **)i, *(char **)j); }
int main()
  { const int Nmax = 1000;
    const int Mmax = 10000;
    char* a[Nmax]; int N;
    char buf[Mmax]; int M = 0;
    for (N = 0; N < Nmax; N++)
      {
        a[N] = &buf[M];
        if (!(cin >> a[N])) break; 
        M += strlen(a[N])+1;
      }
    // std::cout << "Number of strings entered are " << N << std::endl;
    qsort(a, N, sizeof(char*), compare);
    for (int i = 0; i < N; i++) 
      cout << a[i] << endl;
  }

Upvotes: 0

Views: 721

Answers (1)

Bo Persson
Bo Persson

Reputation: 92371

If you type the input at the console, you have to enter the end-of-file code.

For Linux this would be Ctrl+D, and for Windows Ctrl+Z.

Upvotes: 8

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