- 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 Count Even and Odd Numbers in an Array
This article provides you with some programs in C++ that count the number of even and odd numbers available in an array. The array must be entered by the user at run-time.
Count the even and odd numbers in a 10-number array
The question is: write a program in C++ that receives an array of 10 numbers and counts the even and odd numbers available in the given array. The program given below is the answer to this question:
#include<iostream> using namespace std; int main() { int arr[10], eve=0, odd=0, i; cout<<"Enter 10 Array Elements: "; for(i=0; i<10; i++) cin>>arr[i]; for(i=0; i<10; i++) { if(arr[i]%2==0) eve++; else odd++; } cout<<"\nTotal Number of Even Numbers = "<<eve; cout<<"\nTotal Number of Odd Numbers = "<<odd; cout<<endl; return 0; }
The snapshot given below shows the initial output produced by the above C++ program on counting the total number of even and odd numbers in a given array:
Now supply the input, say 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 as ten array elements, and press the ENTER key to find and print the number of odd and even numbers like shown in the snapshot given below:
The dry run of the above program goes like this:
- If the same ten elements are entered as in the previous sample run, each number is stored in the array one by one in the order arr[0] = 1, arr[1] = 2,... arr[9] = 10.
- Since the user has now been given all ten numbers, the second for loop, which counts even and odd numbers, can start.
- That is, first i = 0 gets executed, which means 0 gets initialized to i. The initialization part executes only once.
- After initialization, the condition i<10 or 0<10 evaluates to be true.
- Therefore, program flow goes inside the loop.
- Inside the loop, the condition of if gets evaluated
- That is, the condition arr[i]%2==0 or arr[0]%2==0 or 1%2==0 evaluates to be false.
- Therefore, program flow does not go inside if's body, but rather it goes to else's body and executes the statement
odd++;
- Since the initial value of odd is 0, odd is now 1.
- Now the program flow goes to the update part of the loop, which is the increment part.
- So the value of i gets incremented; i = 1 now.
- Once again, the condition i<10 or 1<10 evaluates to true.
- Therefore, program flow again goes inside the loop.
- Again, the condition of if gets evaluated
- But this time, the condition arr[i]%2==0 or arr[1]%2==0 or 2%2==0 or 0==0 evaluates to be true.
- Therefore, program flow goes inside its body (if's body), and this time the value of the eve variable gets incremented. As a result, eve=1 now.
- Again, the value of i gets incremented. So i is now equal to 2.
- And the condition i<10 or 2<10 evaluates to true once more.
- So, the program flow goes back into the loop, and this keeps happening until the condition is no longer true.
- In this way, the two variables, one for even number counting, and the other for odd number counting, hold the result.
- Therefore, just print the value of these two variables as a result, as shown in the sample run given above.
Count the number of even and odd numbers in an array of n numbers
This is the modified version of the previous program because this program allows the user to define the size of the array along with its elements.
#include<iostream> using namespace std; int main() { int tot, arr[100], i, eve=0, odd=0; cout<<"Enter the Size of Array (max. 100): "; cin>>tot; cout<<"Enter "<<tot<<" Array Elements: "; for(i=0; i<tot; i++) cin>>arr[i]; for(i=0; i<tot; i++) { if(arr[i]%2==0) eve++; else odd++; } cout<<endl; if(eve>1) cout<<"There are "<<eve<<" Even Numbers."; else { if(eve==1) cout<<"There is only 1 Even Number."; else cout<<"There is no any Even Number."; } cout<<endl; if(odd>1) cout<<"There are "<<odd<<" Odd Numbers."; else { if(odd==1) cout<<"There is only 1 Odd Number."; else cout<<"There is no any Odd Number."; } cout<<endl; return 0; }
Here is its sample run with user input, 4 as size, and 1, 2, 5, and 7 as four array elements:
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