C program to separate Odd and Even numbers from an array

In this tutorial, we will discuss the C program to separate Odd and Even numbers from an array

In this post, we are going to learn how to separate the even and odd numbers from the given array

C program to separate the number of Odd or Even from an array — C program to separate Odd and Even numbers

First, we must understand how to identify odd numbers or even numbers

What is Even and Odd

When the number is divided by 2 and the balance becomes zero and the above number is called as the even number – eg 2,4,6,8,10

and on the other sides when it is divided by 2 and balance becomes 1 they are called odd numbers or uneven numbers

In my previous post, I have explained the various approaches to check whether the number is even or odd using C language

There are three examples given below

The procedure of this program

initially, the user will enter the size of the array and store in the variable size to define the array size
And declare an integer type array for stored elements
Then, the user enters all the elements of the array according to the array size
After that, use a for loop for iterating elements of the array
finally, the following two for loops filter even and odd number using modular operator from the array

Program 1

Separate even and odd numbers using the for loop

The program allows the user to enter the size of the array and the array elements.

Then, it will separate the even and odd numbers from this array using for loop in C language

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int arr[100],i,num;
    printf("Enter size of the array\n");

    scanf("%d",&num);//reads input from user for array size
    printf("Enter the elements of the array\n");

    for(i=0; i<num; i++){
        scanf("%d",&arr[i]);//reads input from user for array elements
    }

    printf("\nEven numbers of the array are \n");
     for(i=0; i<num; i++){
        if(arr[i]%2==0){
            printf("%d \t",arr[i]);
        }
    }

    printf("\nOdd numbers of the array are \n");
     for(i=0; i<=num; i++){
        if (arr[i]%2==1){
            printf("%d \t",arr[i]);
        }
    }
    getch();
    return 0;
}

When the above code is executed, it produces the following results

Enter size of the array
8
Enter the elements of the array
23
34
45
56
67
78
89
90

Even numbers of the array are
34   56   78    90
Odd numbers of the array are
23   45   67    89

Program 2

Separate even and odd numbers using the while loop

The program allows the user to enter the size of the array and the array elements.

Then, it will separate the even and odd numbers from this array using while loop in C language

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int arr[100],i,num;
    printf("Enter size of the array \n");

    scanf("%d",&num);//reads input from user for array size
    printf("Enter the elements of the array\n");

    i=0;
    while(i<num){
        scanf("%d",&arr[i]);//reads input from user for array elements
         i++;
    }

    printf("\nEven numbers of the array are \n");
    i=0;
     while(i<num){
        if(arr[i]%2==0){
            printf("%d \t",arr[i]);
        }
        i++;
    }

    printf("\nOdd numbers of the array are \n");
    i=0;
     while(i<=num){
        if (arr[i]%2==1){
            printf("%d \t",arr[i]);
        }
        i++;
    }
    getch();
    return 0;
}

When the above code is executed, it produces the following results

Enter size of the array
8
Enter the elements of an array
24
35
46
57
68
79
80
98

Even number of an array are
24    46     68     80   98
Odd numbers of an array are
35    57     79

Program 3

Separate even and odd numbers using the do-while loop

The program allows the user to enter the size of the array and the array elements.

Then, it will separate the even and odd numbers from this array using the do-while loop in C language

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int arr[100],i,num;
    printf("Enter size of the array\n");

    scanf("%d",&num);//reads input from user for array size
    printf("Enter the elements of the array\n");

    i=0;
    do{
        scanf("%d",&arr[i]);//reads input from user for array elements
         i++;
    }while(i<num);

    printf("\nEven numbers of the array are \n");
    i=0;
     do{
        if(arr[i]%2==0){
            printf("%d \t",arr[i]);
        }
        i++;
    }while(i<num);

    printf("\nOdd numbers of the array are \n");
    i=0;
     do{
        if (arr[i]%2==1){
            printf("%d \t",arr[i]);
        }
        i++;
    }while(i<=num);
    getch();
    return 0;
}

When the above code is executed, it produces the following results

Enter size of the array
8
Enter the elements of an array
98
87
76
65
54
43
32
21

Even number of an array are
98    76     54     32
Odd numbers of an array are
87    65     43     21

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