Test Case Generation | Set 5 (Generating random Sorted Arrays and Palindromes)

Difficulty Level : Hard
Last Updated : 28 Jun, 2021

Generating Random Sorted Arrays
We store the random array elements in an array and then sort it and print it.

// A C++ Program to generate test cases for
// array filled with random numbers
#include<bits/stdc++.h>
using namespace std;
  
// Define the number of runs for the test data
// generated
#define RUN 5
  
// Define the range of the test data generated
#define MAX 100000
  
// Define the maximum number of array elements
#define MAXNUM 100
  
int main()
{
    // Uncomment the below line to store
    // the test data in a file
    // freopen("Test_Cases_Random_Sorted_Array.in",
    //          "w", stdout);
  
    // For random values every time
    srand(time(NULL));
  
    int NUM;    // Number of array elements
  
    for (int i=1; i<=RUN; i++)
    {
        int arr[MAXNUM];
  
        NUM = 1 + rand() % MAXNUM;
  
        // First print the number of array elements
        printf("%d\n", NUM);
  
        // Then print the array elements separated by
        // space
        for (int j=0; j<NUM; j++)
            arr[j] = rand() % MAX;
  
        // Sort the generated random array
        sort (arr, arr + NUM);
  
        // Print the sorted random array
        for (int j=0; j<NUM; j++)
            printf("%d ", arr[j]);
  
        printf("\n");
    }
  
    // Uncomment the below line to store
    // the test data in a file
    // fclose(stdout);
    return(0);
}

Generating Random Palindromes

The test case generation plan generates odd as well as even length palindromes.
The test case generation plan uses one of the most under-rated data structure- Deque
Since a palindrome is read the same from left as well as right so we simply put the same random characters on both the left side (done using push_front()) and the right side (done using push_back())

// A C++ Program to generate test cases for
// random strings
#include<bits/stdc++.h>
using namespace std;
  
// Define the number of runs for the test data
// generated
#define RUN 5
  
// Define the range of the test data generated
// Here it is 'a' to 'z'
#define MAX 25
  
// Define the maximum length of string
#define MAXLEN 50
  
int main()
{
    // Uncomment the below line to store
    // the test data in a file
    // freopen("Test_Cases_Palindrome.in", "w",
    //                                  stdout);
  
    // For random values every time
    srand(time(NULL));
  
    // A container for storing the palindromes
    deque<char> container;
    deque<char>::iterator it;
  
    int LEN;    // Length of string
  
    for (int i=1; i<=RUN; i++)
    {
        LEN = 1 + rand() % MAXLEN;
  
        // First print the length of string
        printf("%d\n", LEN);
  
        // If it is an odd-length palindrome
        if (LEN % 2)
            container.push_back('a' + rand() % MAX);
  
        // Then print the characters of the palindromic
        // string
        for (int j=1; j<=LEN/2; j++)
        {
            char ch = 'a' + rand() % MAX;
            container.push_back(ch);
            container.push_front(ch);
        }
  
        for (it=container.begin(); it!=container.end(); ++it)
            printf("%c",*it);
  
        container.clear();
        printf("\n");
    }
  
    // Uncomment the below line to store
    // the test data in a file
    // fclose(stdout);
    return(0);
}

This article is contributed by Rachit Belwariar. If you like GeeksforGeeks and would like to contribute, you can also write an article using write.geeksforgeeks.org or mail your article to review-team@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

References : –
http://spojtoolkit.com/TestCaseGenerator/

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Test Case Generation | Set 5 (Generating random Sorted Arrays and Palindromes)