C Programming – Day 5 | Arrays in C (1D & 2D) Arrays Explained for Beginners

ARRAYS IN C (1D & 2D)

DAY - 5

We’ll continue learning...........

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📍 Day-5 — Arrays in C (1D & 2D)

Today you will learn:

✅ What is an array?
✅ Declaring and initializing arrays
✅ Input/Output using loop
✅ Finding largest number
✅ 2D array (matrix) basics
✅ Task + Quiz

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✅ 1️⃣ What is an Array?

📌 An array stores multiple values of same data type in continuous memory.

Example:

int marks[5];

📌 Index starts from 0
So marks[0] → 1st element

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✅ 2️⃣ Array Initialization

int nums[5] = {10, 20, 30, 40, 50};

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✅ 3️⃣ Input & Print Array Using Loop

int arr[5];

for(int i=0; i<5; i++){
    scanf("%d", &arr[i]);
}

for(int i=0; i<5; i++){
    printf("%d ", arr[i]);
}

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✅ 4️⃣ Find Largest Element in Array

int arr[5] = {10, 25, 5, 45, 30};
int max = arr[0];

for(int i=1; i<5; i++){
    if(arr[i] > max)
        max = arr[i];
}

printf("Largest = %d", max);

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✅ 5️⃣ 2D Array (Matrix)

int a[2][3] = {
    {1, 2, 3},
    {4, 5, 6}
};

Rows = 2
Columns = 3

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🧪 Practice Example (Sum of 2D Matrix)

int mat[2][2], sum = 0;

for(int i=0; i<2; i++){
    for(int j=0; j<2; j++){
        scanf("%d", &mat[i][j]);
        sum += mat[i][j];
    }
}
printf("Sum = %d", sum);

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✅ Task-5 (Required for PDF ✅)

Write a program to:

✔ Input size n
✔ Create array of n numbers
✔ Find smallest number in the array
✔ Print result

📌 Use for loop
📌 Use integer type

Example:

Input: 5 elements: 3 8 2 9 6
Output: Smallest = 2

➡ Send your code ✅

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📝 Quick Quiz — Day-5

Reply like: 1A, 2C, 3B

1️⃣ In array, index starts from:
A) 0
B) 1
C) -1

2️⃣ 2D array is a collection of:
A) Strings
B) Characters
C) Arrays

3️⃣ Which statement is correct about arrays?
A) Store different data types
B) Continuous memory
C) Infinite size

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✅ When you reply with:

✔ Task-5 code
✔ Quiz answers
➡ I will mark Day-5 Completed

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Take your time — send Task-5 anytime ✅
Ready when you are! 😄

✅ NEXT - DAY - 6