One Dimensional Array in C++ Programming | Complete Beginner Guide

One Dimensional Array in C++ Programming | Complete Beginner Guide

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Single Dimensional Array in C++

Array: A one-dimensional array in c++ is a collection of data of same data types. It can store data of same data types means an integer array can store integer value and character array can store character value. Arrays is allow to store multiple values of the same data type in a single variable. We do not creating separate variables like student1, student2, student3, you can create one array to hold all students. Array can be used to group of data simultaneously. We can not fetch data from array value directly therefore we can use index point value. The indexing of array always start with 0 and index value is always integer value. 

C++ Array Declaration Syntax

• Data_type: The array data type of data that the array will hold (int, float, char, etc.).
• Array_name: The name you choose for the array.
• Array_size: The number of elements the array can hold.

data_type array_name[array_size]={Array_Values}; int a[5]={10.40,60,80,70}; value=10,40,60,80,70; index=a[0][1][2][3][4][5]; a[0]=10 a[1]=40 a[2]=60 a[3]=80 a[4]=70

C++ Array Initialization

Array is the are several ways to initialize arrays. The choice of initialization method depends on the requirements of your C++ program. Here are some common methods for initializing arrays in C++.

C++ Array Initialization After Declaration

• Array_Data_Type: The type of data that the array will hold (integer, float, character etc.).
• Array_Name: The name you choose for the array.
• Array_Size: The number of elements the array can hold. {data1, data2,data3 ... dataN}:

int a[5]={20.40,60,80,90}; value=10,40,60,80,70; index=a[0][1][2][3][4][5]; a[0]=20 a[1]=40 a[2]=60 a[3]=80 a[4]=90

The values to initialize the array with the number of elements inside the curly braces must match the size of the array.

We declare and initialize an integer array numbers with a size of 5 and we provide five values. If you don't specify all the values during initialization. C++ will automatically initialize the remaining elements to zero or garbage for numeric types (integer, float, character) or null characters for character arrays.

Example of Array in C++ Program

#include<iostream> using namespace std; int main(){ int a[5]={10,40,60,80,70}; cout<<"Value of a[0]:"<<a[0]<<endl; cout<<"Value of a[1]:"<<a[1]<<endl; cout<<"Value of a[2]:"<<a[2]<<endl; cout<<"Value of a[3]:"<<a[3]<<endl; cout<<"Value of a[4]:"<<a[4]<<endl; } ============OUTPUT============ Value of a[0]:10 Value of a[1]:40 Value of a[2]:60 Value of a[3]:80 Value of a[4]:70

C++ Compile Time Array Initialization

Compile Time: A Compile-time initialization refers to the process of initializing an array with known values at the time of writing the code, before the program is compiled.

• This is typically done using constant values or expressions that can be evaluated at compile time.
• Arrays initialized at compile time are often referred to as "static" or "constant" arrays because their values cannot change during program execution.
• Compile-time initialized arrays are placed in the program's data segment or read-only memory, depending on whether they are marked as const.

Print Array Element Using For Loop  

#include<iostream> using namespace std; int main(){ int a[5]={10,40,60,80,70}; for(int i=0;i<5;i++) { cout<<"Value of a:["<<i<<"]:"<<a[i]<<endl; } } ============OUTPUT============ Value of a[0]:10 Value of a[1]:40 Value of a[2]:60 Value of a[3]:80 Value of a[4]:70

Array Length in CPP Function

A array size of an array using the sizeof operator. The sizeof operator returns the size in bytes of the entire array elements. To get the number of array elements or divide the total size of a single array element.

How To Get Array Length in C++  

#include<iostream> using namespace std; int main(){ int a[10] = {20, 48, 87, 56, 19,10,89}; int array_size = sizeof(a)/sizeof(a[0]); cout<<"Total Array_Size:"<<array_size; } ============OUTPUT============ Total Array_Size:10

C++ Initialize Array at Runtime

Runtime initialization array occurs when the values for the array elements are  determined and assigned during the execution of the program. This is useful when you need to read values from user input perform calculations to determine the array elements. Arrays initialized at runtime can be modified during program execution.

How to Store User Input into an Array in C++  

#include<iostream> using namespace std; int main(){ int a[10],n,i; cout<<"Enter Array Size:"; cin>>n; for(i=0;i<n;i++) {     cout<<"Enter Array Element:["<<i<<"]:";     cin>>a[i]; } for(i=0;i<n;i++) { cout<<"Value of a:["<<i<<"]:"<<a[i]<<endl; } } ============OUTPUT============ Enter Array Size:5 Enter Array Element[0]:67 Enter Array Element[1]:86 Enter Array Element[2]:45 Enter Array Element[3]:89 Enter Array Element[4]:43 Value of a[0]:67 Value of a[1]:86 Value of a[2]:45 Value of a[3]:89 Value of a[4]:43

Update Array Element in C++

A Array element update or change the value of an array element by assigning a new value to  using index number.

Write a C++ program to modify contents of an integer array  

#include<iostream> using namespace std; int main(){ int i,a[5] = {20, 48, 87, 56, 19}; for(i=0;i<5;i++){ cout<<"Before Array Element:["<<i<<"]:"<<a[i]<<endl; } a[2]=100; for(i=0;i<5;i++){ cout<<"After Change Array Element:["<<i<<"]:"<<a[i]<<endl; } } ============OUTPUT============ Before Array Element[0]:20 Before Array Element[1]:48 Before Array Element[2]:87 Before Array Element[3]:56 Before Array Element[4]:19 After Change Array Element[0]:20 After Change Array Element[1]:48 After Change Array Element[2]:100 After Change Array Element[3]:56 After Change Array Element[4]:19

Conclusion of One Dimensional Array in C++

Conclusion: This is a all about one-Dimensional array in C++ language. In this article cover of every concept of related array. Array program you can understand simple easy method. If your any query or problems array related than you can contact me by email. I can more easy solution provide.