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C++ Exercises: Rearrange the elements of a given array of integers in zig-zag fashion way

C++ Array: Exercise-12 with Solution

Write a C++ program to rearrange the elements of a given array of integers in zig-zag fashion way.
Note: The format zig-zag array in form a < b > c < d > e < f.

Sample Solution:

C++ Code :

#include<iostream>
using namespace std;
 
void zig_zag_array(int nums[], int n)
{
    bool ans = true;
 
    for (int i=0; i<=n-2; i++)
    {
        if (ans) 
        {
            if (nums[i] > nums[i+1])
                swap(nums[i], nums[i+1]);
        }
        else  
        {
            if (nums[i] < nums[i+1])
                swap(nums[i], nums[i+1]);
        }
        ans = !ans; 
    }
}
 
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] <<" ";
    zig_zag_array(nums, n);
    cout << "\nNew array elements: ";
    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 
New array elements: 0 3 1 5 4 7 6 10 8 

Flowchart:

Flowchart: Rearrange the elements of a given array of integers in zig-zag fashion way

C++ Code Editor:

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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