C program to print alternate numbers of an user input array

C program to print alternate numbers of an user input array :

In this tutorial, we will learn how to print alternate numbers of an array . User will enter the total count of numbers the array will hold. Then the program will take input for each position of that array. Let’s take a look into the program first :

C program :

#include

int main()
{
  //1
  int i;
  int size;

  //2
  printf("How many numbers you want to enter : ");
  scanf("%d",&size);

  //3
  int array[size];

  //4
  for(i=0;i<size;i++){
    printf("Enter number %d : ",i+1);
    scanf("%d",&array[i]);
  }

  //5
  printf("Alternate elements of the input array : \n");
  for(i=0; i

Explanation :

The commented numbers in the above program denotes the step number below :

1. Create one variable i to use in the loop . One variable size to store the size of the array.
2. Ask the user how many numbers he is entering. Store this value in variable size.
3. Create one array with size as user has entered.
4. Run one for loop to read contents for the array. Read each elements and store it in the array.
5. Use one more for loop and print alternate elements of the array. In this loop, we are incrementing the value of i by 2 like i += 2 . Not i++. So, this loop will print alternate numbers in the array.

Sample Output :

How many numbers you want to enter : 10
Enter number 1 : 1
Enter number 2 : 2
Enter number 3 : 3
Enter number 4 : 4
Enter number 5 : 5
Enter number 6 : 6
Enter number 7 : 7
Enter number 8 : 8
Enter number 9 : 9
Enter number 10 : 10
Alternate elements of the input array :
1
3
5
7
9
How many numbers you want to enter : 10
Enter number 1 : 10
Enter number 2 : 9
Enter number 3 : 8
Enter number 4 : 7
Enter number 5 : 6
Enter number 6 : 5
Enter number 7 : 4
Enter number 8 : 3
Enter number 9 : 2
Enter number 10 : 1
Alternate elements of the input array :
10
8
6
4
2