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C++ Exercises: Rearrange a given sorted array of positive integers

C++ Array: Exercise-15 with Solution

Write a C++ program to rearrange a given sorted array of positive integers.
Note: In final array, first element should be maximum value, second minimum value, third second maximum value, fourth second minimum value, fifth third maximum and so on.

Sample Solution:

C++ Code :

#include <iostream>
using namespace std;
 
void rearrange_max_min(int nums[], int n)
{
    int temp[n];
    int small_num=0, large_num=n-1;
    int result = true;
 
    for (int i=0; i<n; i++)
    {
        if (result)
            temp[i] = nums[large_num--];
        else
            temp[i] = nums[small_num++];
 
        result = !result;
    }
 
     for (int i=0; i<n; i++)
        nums[i] = temp[i];
}
 
int main()
{
    int nums[] = {0, 1, 3, 4, 5, 6, 7, 8, 10}; 
    int n = sizeof(nums)/sizeof(nums[0]);
   	cout << "Original array: ";
    for (int i=0; i < n; i++) 
    cout << nums[i] <<" ";
    rearrange_max_min(nums, n);
 
    printf("\nArray elements after rearranging: ");
      for (int i=0; i < n; i++) 
      cout << nums[i] <<" ";
        return 0;
     
}

Sample Output:

Original array: 0 1 3 4 5 6 7 8 10 
Array elements after rearranging: 10 0 8 1 7 3 6 4 5    

Flowchart:

Flowchart: Rearrange a given sorted array of positive integers

C++ Code Editor:

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Next: Write a C++ program to sort a given array of 0s, 1s and 2s. In the final array put all 0s first, then all 1s and all 2s in last.

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C++ Programming: Tips of the Day

Can I assume (bool)true == (int)1 for any C++ compiler?

According to the standard, you should be safe with that assumption. The C++ bool type has two values - true and false with corresponding values 1 and 0.

The thing to watch about for is mixing bool expressions and variables with BOOL expression and variables. The latter is defined as FALSE = 0 and TRUE != FALSE, which quite often in practice means that any value different from 0 is considered TRUE.

A lot of modern compilers will actually issue a warning for any code that implicitly tries to cast from BOOL to bool if the BOOL value is different than 0 or 1

Ref: https://bit.ly/3PWhs5N