- C++ Programming Examples
- C++ Programming Examples
- C++: Hello World
- C++: Get Input
- C++: Print Integer
- C++: Add two numbers
- C++: Add, Sub, Multiply, Div
- C++: Add Digits
- C++: Find Average and Percentage
- C++: Find Arithmetic Mean
- C++: Sum of n Natural Numbers
- C++: Sum of n Numbers
- C++: Square's Area and Perimeter
- C++: Rectangle's Area and Perimeter
- C++: Triangle's Area and Perimeter
- C++: Area and Circumference
- C++: Find Simple Interest
- C++: Fahrenheit to Celsius
- C++: Celsius to Fahrenheit
- C++: Print Prime Numbers
- C++: Reverse a Number
- C++: Swap Two Numbers
- C++: Print Multiplication Table
- C++: Find Factorial of a Number
- C++: Find Factors of a Number
- C++: Find HCF and LCM
- C++: Create a Calculator
- C++: Count Digits in a Number
- C++: First and Last Digit Sum
- C++: Product of Number Digits
- C++: Sum of Squares of Digits
- C++: Interchange Digits of Number
- C++ if-else Programs
- C++: Check Even or Odd
- C++: Check Prime or Not
- C++: Check Alphabet or Not
- C++: Check Vowel or Not
- C++: Check Leap Year or Not
- C++: Check Reverse equals Original
- C++: Check Perfect Number
- C++: Check Palindrome or Not
- C++: Check Armstrong or Not
- C++: Divisibility Test
- C++: Find Labor Wage
- C++: Find Discounted Price
- C++: Find Shipping Charge
- C++: Find Telephone Bills
- C++: Calculate Student Grade
- C++: Largest of Two Numbers
- C++: Largest of Three Numbers
- C++ Number Conversion
- C++: Decimal to Binary
- C++: Decimal to Octal
- C++: Decimal to Hexadecimal
- C++: Binary to Decimal
- C++: Binary to Octal
- C++: Binary to Hexadecimal
- C++: Octal to Decimal
- C++: Octal to Binary
- C++: Octal to Hexadecimal
- C++: Hexadecimal to Decimal
- C++: Hexadecimal to Binary
- C++: Hexadecimal to Octal
- C++ Pattern Programs
- C++: Pattern Programs
- C++: Print Diamond Pattern
- C++: Print Floyd's Triangle
- C++: Print Pascal's Triangle
- C++ Array Programs
- C++: 1D Array Program
- C++: Linear Search
- C++: Binary Search
- C++: Largest Element in an Array
- C++: Smallest Element in an Array
- C++: Find Second Largest Element
- C++: Find Second Smallest Element
- C++: Sum of All Elements
- C++: Multiply All Elements
- C++: Element in Even Position
- C++: Element in Odd Position
- C++: Print Even Numbers in Array
- C++: Print Odd Numbers in Array
- C++: Count Even or Odd Numbers
- C++: Sum of Even or Odd Numbers
- C++: Count Positive, Negative, Zero
- C++: Reverse an Array
- C++: Insert an Element
- C++: Delete an Element
- C++: Merge two Arrays
- C++: Bubble Sort
- C++: Selection Sort
- C++: Insertion Sort
- C++: Common Elements
- C++: 2D Array Programs
- C++: Add Two Matrices
- C++: Subtract Two Matrices
- C++: Transpose Matrix
- C++: Multiply Two Matrices
- C++: 3D Array Programs
- C++ String Programs
- C++: Print String
- C++: Find String Length
- C++: Compare Two Strings
- C++: Copy String
- C++: String Concatenation
- C++: Reverse a String
- C++: Delete Vowels from a String
- C++: Delete a Word from a String
- C++: Count Characters in a String
- C++: Count Words in a String
- C++: Frequency of Words
- C++: Remove Spaces from Strings
- C++: Sort a String
- C++: Uppercase to Lowercase
- C++: Lowercase to Uppercase
- C++: Swap Two Strings
- C++: Check the Anagram or Not
- C++: Capitalize All Words in a String
- C++: Get Numbers from a String
- C++ File Programs
- C++: Read a File
- C++: Write Content to a File
- C++: Append Data to a File
- C++: Read and Display File
- C++: Copy a File
- C++: Merge Two Files
- Count Characters in a File
- C++: Capitalize Every Word
- C++: List Files in Directory
- C++: Delete a File
- C++: Encrypt and Decrypt a File
- C++ Misc Programs
- C++: Print ASCII Value
- C++: Add Binary Numbers
- C++: Generate Random Numbers
- C++: Print a Smiling Face
- C++: Days into Years and Months
- C++: Add Two Numbers using Pointer
- C++: Print Fibonacci Series
- C++: Generate Armstrong Numbers
- C++: Find nCr and nPr
- C++: Get IP Address
- C++: Print Date and Time
- C++: Shutdown and Restart Computer
- C++ Programming Tutorial
- C++ Tutorial
C++ Program to Find and Print Even Numbers in an Array
This article is created to cover some programs in C++ that find and print even numbers in an array. The array must be entered by the user at run-time. The list of programs covered in this article is as follows:
- Print even numbers in an array of 10 elements
- Print even numbers in an array of n elements
- Print even numbers in an array of n elements using another array
Print even numbers in an array of 10 elements
The question is: create a C++ program that prints even numbers from an array supplied by the user. The answer to this question is the program given below:
#include<iostream> using namespace std; int main() { int arr[10], i; cout<<"Enter any 10 numbers: "; for(i=0; i<10; i++) cin>>arr[i]; cout<<"\nEven Numbers are:\n"; for(i=0; i<10; i++) { if(arr[i]%2==0) cout<<arr[i]<<" "; } cout<<endl; return 0; }
The initial output produced by the above C++ program on printing all even numbers available in a given array is shown in the snapshot given below:
Now enter any ten numbers, such as 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, and press the ENTER key to find and print all the even numbers, as shown in the screenshot below:
The following is the dry run of the above program with the exact same user input as provided above:
- When the user enters 10 elements or numbers, the index-wise storage of these numbers will be arr[0] = 11, arr[1] = 12, arr[2] = 13,... arr[9] = 20.
- Now the execution of the second for loop begins.
- That is, i=0, and the condition i<10 or 0<10 evaluates to be true.
- Therefore, program flow goes inside the loop, and the condition of if gets evaluated.
- That is, because the condition arr[i]%2==0 or arr[0]%2==0 or 11%2==0 or 1==0 evaluates to false, program flow does not proceed to the body of if.
- Now the value of i gets incremented using i++ (third statement of the loop). So i is now equal to 1.
- The condition of the for loop again gets evaluated with a new value of i.
- This time, the condition i<10 or 1<10 evaluates to true as well.
- Therefore, again, program flow goes inside the loop.
- And the condition arr[i]%2==0, arr[1]%2==0, 12%2==0, or 0==0 evaluates to true.
- Therefore, this time, program flow goes inside the if's body.
- And the value of arr[i] or arr[1], which is 12, gets printed on the output.
- Again, a second time, the value of i gets incremented. Now i=2.
- And the condition i<10 or 2<10 evaluates to true once more.
- Therefore, the program again goes inside the loop.
- This process continues until the condition is evaluated as false.
- In this way, one by one, all even numbers get printed.
Print even numbers in an array of n numbers
Now let's modify the above program and create a new one that allows the user to define the size of the array. Also, this program prints a message if no even numbers are found.
#include<iostream> using namespace std; int main() { int n, i, temp=0; cout<<"Enter the size of array: "; cin>>n; int arr[n]; cout<<"Enter any "<<n<<" numbers: "; for(i=0; i<n; i++) cin>>arr[i]; for(i=0; i<n; i++) { if(arr[i]%2==0) { if(temp==0) cout<<"\nEven Numbers are:\n"; cout<<arr[i]<<" "; temp=1; } } if(temp==0) cout<<"\nEven number not found!"; cout<<endl; return 0; }
A sample run of the above program with user input of size 4 and 1, 3, 5, 7 as four numbers is shown below:
Here is another sample run with user input of 6 as size and 11, 22, 33, 44, 55, and 66 as six numbers for the array:
Print even numbers in an array using another array
This program uses another array that stores all the even numbers from the array given by the user. After storing all even numbers from the given array in the second (another) array one by one, Just print the elements of the second array as shown in the program given below:
#include<iostream> using namespace std; int main() { int n, i, j=0; cout<<"Enter the size of array: "; cin>>n; int arr[n], eve[n]; cout<<"Enter any "<<n<<" numbers: "; for(i=0; i<n; i++) { cin>>arr[i]; if(arr[i]%2==0) { eve[j] = arr[i]; j++; } } if(j==0) cout<<"\nEven number not found!"; else if(j==1) cout<<"\nThere is only 1 even number found. That is:\n"<<eve[0]; else { cout<<"\nList of Even Numbers:\n"; for(i=0; i<j; i++) cout<<eve[i]<<" "; } cout<<endl; return 0; }
Here is its sample run with user input of 3 as size and 11, 22, and 33 as three numbers:
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