C Exercises: Generate a random permutation of array elements

C Array: Exercise-77 with Solution

Write a program in C to generate random permutations of array elements.

Pictorial Presentation:

Sample Solution:

C Code:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
 
void changeValues (int *a, int *b)
{
    int temp = *a;
    *a = *b;
    *b = temp;
}

void ArrayDisplay (int arr1[], int n)
{
	printf("The shuffled elements in the array are:  \n");    
    for (int i = 0; i < n; i++)
        printf("%d ", arr1[i]);
    printf("\n");
}
void shuffleRandon ( int arr1[], int n )
{
    srand ( time(NULL) );
    for (int i = n-1; i > 0; i--)
    {
        int j = rand() % (i+1);
        changeValues(&arr1[i], &arr1[j]);
    }
}
int main()
{
    int arr1[] = {1, 2, 3, 4, 5, 6, 7, 8};
    int n = sizeof(arr1)/ sizeof(arr1[0]);
	int i;
 //------------- print original array ------------------	
	printf("The given array is:  \n");
	for(i = 0; i < n; i++)
		{
			printf("%d  ", arr1[i]);
		}
	printf("\n");
//------------------------------------------------------ 		
    shuffleRandon (arr1, n);
    ArrayDisplay(arr1, n);
    return 0;
}

Sample Output:

The given array is: 
1  2  3  4  5  6  7  8  
The shuffled elements in the array are:  
2 8 7 3 4 5 1 6 

Flowchart:

C Programming Code Editor:

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