000_Jan1

January 1

Array

Array ---> Homogenious Data types

1. A simple program that shows how to access single elements and all the elements in an array.

// How to access a declared array in c++

#include <iostream>
using namespace std;

int main() {
    int marks[] = {47,34,372,62,52,42,52,62};

    //accessing single element
    cout << marks[3] << endl;           //47

    //accessing all elements
    for(int i=0; i < 8; i++) {
        cout << marks[i] << " ";
    }

    return 0;
}

2. Program that finds the sum of all the elements in an array using for loop

// Find the sum of all the elements of an array

#include <iostream>
using namespace std;

int main() {
    int marks[] = {47,34,372,62,52,42,52,62};
    int sum = 0;

    // sum of all the elements in array
    for(int i=0; i < 8; i++) {
        sum += marks[i];
    }

    cout << "The sum of all elements is " << sum;

    return 0;
}

Dry run (Sum of all the elements of an array)

marks[i]	i=0 < 8 ++	sum = sum + marks[i]	sum
47	i = 0 (true)	sum = 0 + 47	47
34	i = 1 (true)	sum = 47 + 34	81
372	i = 2 (true)	sum = 81 + 372	453
62	i = 3 (true)	sum = 453 + 62	515
52	i = 4 (true)	sum = 515 + 52	567
42	i = 5 (true)	sum = 567 + 42	609
52	i = 6 (true)	sum = 609 + 52	661
62	i = 7 (true)	sum = 661 + 62	723