Shuffle an array in C and C++

Shuffle an array in C and C++

C Program

#include<stdio.h>
  void shuffle(int *arr, int size){
     int i, j, randomIndex, flag;
     int temp_arr[size], temp[size];

     srand(time(0)); // random number generate
     i = 0;
     while(1){
        randomIndex = rand() % size;
        if(i == 0)
            temp_arr[i++] = randomIndex;
        else{
            flag = 0;
            for(j = 0; j <= i; j++){
                if(temp_arr[j] == randomIndex){
                    flag = 1;
                    break;
                }
            }
            if(flag == 0){
                temp_arr[i++] = randomIndex;
            }
        }
        if(i == size)
            break;
     }
     for(i = 0; i < size; i++){
        temp[i] = arr[temp_arr[i]];
     }
     for(i = 0; i < size; i++){
        arr[i] = temp[i];
     }

  }
 int main(){
    int i;
    int arr[] = {11, 33, 44, 22, 66, 55, 88, 77, 99};

    printf("Shuffle");
    for(i = 0; i < 9; i++)
        printf("%4d", arr[i]);


    shuffle(arr, 9);

    printf("\n");
    for(i = 0; i < 9; i++)
        printf("%4d", arr[i]);

   return 0;
 }

C++ Program

#include<iostream>
#include<time.h>
  using namespace std;
  void shuffle(int *arr, int size){
     int i, j, randomIndex, flag;
     int temp_arr[size], temp[size];

     srand(time(0)); // random number generate
     i = 0;
     while(1){
        randomIndex = rand() % size;
        if(i == 0)
            temp_arr[i++] = randomIndex;
        else{
            flag = 0;
            for(j = 0; j <= i; j++){
                if(temp_arr[j] == randomIndex){
                    flag = 1;
                    break;
                }
            }
            if(flag == 0){
                temp_arr[i++] = randomIndex;
            }
        }
        if(i == size)
            break;
     }
     for(i = 0; i < size; i++){
        temp[i] = arr[temp_arr[i]];
     }
     for(i = 0; i < size; i++){
        arr[i] = temp[i];
     }

  }
 int main(){
    int i;
    int arr[] = {11, 33, 44, 22, 66, 55, 88, 77, 99};

    cout<<endl<<"Shuffle ";
    for(i = 0; i < 9; i++)
        cout<<arr[i]<<"  ";


    shuffle(arr, 9);

    cout<<endl;
    for(i = 0; i < 9; i++)
        cout<<arr[i]<<"  ";

   return 0;
 }

Output :-