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  1. Practice
  2. C++
  3. Introduction
  4. Arrays Introduction
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Arrays Introduction

  • ramey_steven + 0 comments

    Great solution by 'jorgechiquinv', adding some comments for posterity if you're rusty with C++ like me :-)

    #include <iostream>
using namespace std;


// Every C++ program starts with the main method
int main() {

    // Declare a variable, N for the number of 
    // values entered in from stdin
    int N;
    // Declare a variable i for incrementing 
    int i=0;
    // Read in the initial value from cin into N, 
    // for the number of elements in the array
    cin>>N;
    // Declare a pointer of type int, called A, 
   // and allocated new memory for it of size N
    int *A = new int[N];
    
    // Setup a while loop for as long as cin 
    // is reading in variables, all into the array, A
    while(std::cin>>A[i++]);
    
    // Setup another while loop to output (cout) every 
    // value in A in reverse, using --N to decrement the 
    // the value of N so long as N is true (not equal to zero)
    while(std::cout<<A[--N]<<' ' && N);

    // Un-allocate the memory given to A
    delete[] A;
    
    // Return zero to indicate success
    return 0;
}