C++ Tutorial Index

C++ Tutorial C++ History C++ Installation C++ First Program C++ cin and cout C++ Data type C++ Variable C++ operator C++ Keywords

C++ Control Statements

C++ If C++ Nested if C++ If-else C++ If-else-if C++ Switch C++ Break C++ Continue C++ Goto C++ For loop C++ While loop C++ Do while loop

C++ Functions

C++ Call by Value C++ Call by Reference C++ Recursion Function C++ Inline function C++ Friend function

C++ Arrays

Single dimension array Two dimension array

C++ Strings

C++ Strings

C++ Inheritance

C++ Inheritance Single level Inheritance Multilevel Inheritance Multiple Inheritance Hierarchical Inheritance Hybrid Inheritance

C++ Polymorphism

C++ Polymorphism C++ Overloading C++ Overriding C++ Virtual Function

C++ Pointers

C++ Pointers C++ this pointer

C++ Exception Handling

C++ Exception Handling

C++ Constructors

C++ Constructors Default Constructor Parameterize Constructor Copy constructor Constructor Overloading Destructor

C++ File Handling

C++ File Handling C++ Writing to file C++ Reading file C++ Close file

Miscellaneous

C Vs C++ C++ Comments C++ Data Abstraction C++ Identifier C++ Memory Management C++ Storage Classes C++ Void Pointer C++ Array To Function C++ Expressions C++ Features C++ Interfaces C++ Encapsulation std::min in C++ External merge sort in C++ Remove duplicates from sorted array in C++ Precision of floating point numbers Using these functions floor(), ceil(), trunc(), round() and setprecision() in C++ C++ References C++ Friend Functions C++ Mutable keyword Unary Operators in C++ Initialize Array of objects with parameterized constructors in C++ Differences between #define & const in C/C++ C++ Program to Implement Shell Sort C++ Program to Implement Merge Sort Storage Classes in C Vector resize() in C++ Passing by Reference Vs. Passing by the pointer in C++ Free vs delete() in C++ goto statement in C and C++ C++ program to read string using cin.getline() C++ String Concatenation Heap Sort in C++ Swap numbers in C++ Input Iterators in C++ Fibonacci Series in C++ C ++ Program: Alphabet Triangle and Number Triangle C++ Program: Matrix Multiplication C++ Program to Print Fibonacci Triangle Stack in C++ Maps in C++ Queue in C++ C++ Bitset C++ Algorithms Priority Queue in C++ C++ Multimap C++ Deque Function Pointer in C++ Sizeof() Operators in C++ C++ array of Pointers free() Vs delete in C Timsort Implementation Using C++ CPP Templates C++ Aggregation C++ Enumeration C++ Math Functions C++ Object Class C++ Queue Initialize Vector in C++ Vector in C++ C++ STL Components Function overloading in C++ C++ Maximum Index Problem C++ find missing in the second array C++ Program to find the product array puzzle C++ Program To Find Largest Subarray With 0 Sum C++ Program To Move All Zeros To The End Of The Array C++ Program to find the element that occurs once C++ Program to find the largest number formed from an array Constructor Vs Destructor C++ Namespaces C++ OOPs Concept C++ Static C++ Structs C++ Try-Catch C++ User Defined Exceptions C++ Virtual Destructor C++ vs C# Malloc() and new in C++ Palindrome Number Program in C++ Snake Code in C++ Splitting a string in C++ Structure Vs Class in C++ Virtual Function Vs Pure Virtual Function C++ Bidirectional Iterators C++ Forward Iterators C++ Iterators C++ Output Iterators C++ Range-based For Loop Converting string into integer in C++ LCM Program in C++ Type conversion in C++ Add two numbers using the function in C++ Advantage and disadvantage friend function C++ Armstrong Number Program in C++ ATM machine program in C++ using functions Binary to Decimal in C++ Bit Manipulation in C++ C++ Constructor C++ Dijkstra Algorithm Using the Priority Queue C++ int into String C++ Signal Handling Decimal to Binary in C++ Decimal to Hexadecimal in C++ Decimal to Octal in C++ Factorial Program in C++ Function in C++ Hexadecimal to Decimal in C++ Octal to Decimal in C++ Reverse a Number in C++ Structure Vs Class in C++ C++ Forward Iterators C++ Output Iterators C++ Prime number program Constructor Overloading in C++ Different Ways to Compare Strings in C++ Program to convert infix to postfix expression in C++ SET Data Structure in C++ Upcasting and Downcasting in C++ Reverse an Array in C++ Fast Input and Output in C++ Delete Operator in C++ Copy elision in C++ C++ Date and Time C++ Bitwise XOR Operator Array of sets in C++ Binary Operator Overloading in C++ Binary Search in C++ Implementing the sets without C++ STL containers Scope Resolution Operator in C++ Smart pointers in C++ Types of polymorphism in C++

C++ array to function

Arrays in C++ :

Instead of defining distinct variables for each item, arrays are used to hold numerous values in a single variable.

An array can be declared by specifying the variable type, then the array and then the square brackets that would store the number of elements in the array.

Syntax:

var_type array[no_of_elements]

Example –

String colors[3] = {“red”, “blue”, “green”}

The above example shows an array of colors having 3 colors namely red, blue and green.

Functions in C++ :

A function is a code block that only executes when it is invoked.

The Parameters are data that may be sent into a function.

Functions are used to accomplish certain tasks and are essential for code reuse: Once the code is defined, it may be reused numerous times.

Syntax:

void func(){
	//the piece of code that is to be executed
}

Example –

void func(){
	cout << “This is executed”
}
int main(){
	func(); // function called
	Return 0;
}

Output:

This is executed

In this example, we created a function called func(), which when called in main gave us the required output that it is executed.

Passing Arrays to Function in C++ :

Arrays can be passed as arguments to functions in C++. We can also return arrays from functions.

Make sure you understand C++ Arrays and C++ Functions before learning about providing arrays as a function argument.

Syntax :

returnType functName(datatype arr[size]){
	// code block
}

Example –

int sum(int score[4]) {
	// code block
}

In this Example, the method sum has been supplied an int type array named score(). The array has a size of 4.

C++ Array to Function

1D Array to a Function:

In the C++ language, a one-dimensional array is the most basic type of array. A one-dimensional array is simple to define, initialise, and modify. A one-dimensional array can be used as a function argument and so on.

Example -

// C++ Program to show score of 4 students


#include <iostream>
using namespace std;


// declaring function to show score
//1d array taken as parameter
void show(int s[4]) {
    cout << "Showing marks: " << endl;


    // showing elements of the array    
    for (int k = 0; k < 4; ++k) {
        cout << "Person " << k + 1 << ": " << s[k] << endl;
    }
}


int main() {


    // call and initialize array
    int score[4] = {77,98,91,69};
    
    // call show func
    // pass array as arg
    show(score);


    return 0;
}

Output :

Showing score:
Person 1: 77
Person 2: 98
Person 3: 91
Person 4: 69

In this example,

1. Only the name of the array is used when calling a function with an array as a parameter.

show(score);

The memory location of the first member of array score[4] is represented by the parameter score.

2. However, take note of the show() function's argument.

void show(int s[4])

In this case, we utilise the whole array declaration in the function argument, including the square brackets [].

3. The int s[4] function argument is converted to int* s;. This corresponds to the same address as the array score. This indicates that we're actually modifying the original array score when we manipulate s[4] in the method body.

This is how C++ handles sending an array to a function to save memory and time.

Multi-dimensional Array to Function :

Multidimensional arrays may be simply defined as an array of arrays in C/C++. Tabular format is used to store data in multidimensional arrays (in row-major order).

Multidimensional arrays can also be sent as an argument to the function. As an example

Example –

// C++ Program to display the elements of two
// dimensional array by passing it to a function


#include <iostream>
using namespace std;


// define func 
// pass 2D array as parameter
void show(int no[][2]) {
    cout << "Showing Values: " << endl;
    for (int k = 0; k < 3; ++k) {
        for (int l = 0; l < 2; ++l) {
            cout << "number[" << k << "][" << l << "]: " << no[k][l] << endl;
        }
    }
}


int main() {


    // initializing the 2D array
    int number[3][2] = {
        {1, 2},
        {3, 4},
        {5, 6}
    };


    // call the func
    // pass 2D array as arg
    show(number);


    return 0;
}

Output:

Showing Values:
number[0][0]: 1
number[0][1]: 2
number[1][0]: 3
number[1][1]: 4
number[2][0]: 5
number[2][1]: 6

In this example, we've defined a function called show() in the previous program. The function accepts a two-dimensional array as an input, int no[][2], and outputs the array's elements.

We merely supply the name of the two-dimensional array as the function parameter display when invoking the function (number).

The number of rows in the array does not have to be specified. The number of columns, on the other hand, should always be stated. We used int no[][2] for this reason.

As a function parameter, we may also send arrays with more than two dimensions.



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