C PROGRAMMING PROGRAM • ARRAYS, SEARCHING & SORTING

Count Even and Odd Array Elements

Learn how to count even and odd array elements using a clear C program.

BeginnerArraysLoopsIndexing

PROBLEM UNDERSTANDING

Input and expected output

Sample input

7
1 2 3 4 6 9 10

Sample output

Even = 4
Odd = 3

COMPLETE C PROGRAM

Complete C implementation

#include <stdio.h>

int main(void)
{
    int size, values[100], even = 0, odd = 0;

    printf("Enter array size: ");
    scanf("%d", &size);
    if (size < 1 || size > 100) return 1;
    for (int index = 0; index < size; index++) {
        scanf("%d", &values[index]);
        if (values[index] % 2 == 0) even++; else odd++;
    }
    printf("Even = %d\nOdd = %d\n", even, odd);
    return 0;
}

CURRENT STEP

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SELECTED LINE

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EXPECTED OUTPUT FOR THE SAMPLE

Even = 4
Odd = 3

0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

Read the required input values.
Classify each element by its remainder after division by two.
Display the computed result.

Classify each element by its remainder after division by two.

EFFICIENCY

Time and space complexity

Time complexity

O(n)

Auxiliary space

O(n)

DEBUGGING CHECKLIST

Common mistakes

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Use the correct format specifier for every variable.

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Initialize variables before using their values.

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Check braces, semicolons and input order carefully.

Try it yourself

Practice: Run the program with the sample input, predict its output, and then test one boundary case of your own.