🔤 1D Array in C – Easy Guide with Examples

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🧠 What is a 1D Array?

A 1D (one-dimensional) array is a list of elements stored in continuous memory locations. All elements must be of the same data type.

📌 Syntax of 1D Array in C

data_type array_name[size];

Example:

int numbers[5]; // Declares an integer array of size 5

✅ Initializing a 1D Array

1. Declaration + Initialization

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

2. Declaration first, then input later

int numbers[5];
numbers[0] = 10;
numbers[1] = 20;
// and so on...

🧪 Full Example: Input & Output from a 1D Array

#include <stdio.h>

int main() {
    int i;
    int numbers[5];

    // Input values from user
    printf("Enter 5 numbers:\n");
    for(i = 0; i < 5; i++) {
        printf("Element %d: ", i);
        scanf("%d", &numbers[i]);
    }

    // Display values
    printf("\nYou entered:\n");
    for(i = 0; i < 5; i++) {
        printf("Element at index %d = %d\n", i, numbers[i]);
    }

    return 0;
}

🎯 Sample Output:

Enter 5 numbers:
Element 0: 12
Element 1: 25
Element 2: 33
Element 3: 47
Element 4: 59

You entered:
Element at index 0 = 12
Element at index 1 = 25
Element at index 2 = 33
Element at index 3 = 47
Element at index 4 = 59

🧮 Common Operations on 1D Arrays

1. Sum of all elements:

int sum = 0;
for(i = 0; i < 5; i++) {
    sum += numbers[i];
}
printf("Sum = %d\n", sum);

2. Find largest element:

int max = numbers[0];
for(i = 1; i < 5; i++) {
    if(numbers[i] > max) {
        max = numbers[i];
    }
}
printf("Maximum = %d\n", max);

🔚 Summary Table

Topic	Details
Data type	Must be the same for all items
Index starts	From 0
Access	array[index]
Use	Grouping similar data (e.g. marks, prices)

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