array in c++ function code example

Example 1: how to pass an array to a function

// Program to calculate the sum of array elements by passing to a function 

#include <stdio.h>
float calculateSum(float age[]);

int main() {
    float result, age[] = {23.4, 55, 22.6, 3, 40.5, 18};

    // age array is passed to calculateSum()
    result = calculateSum(age); 
    printf("Result = %.2f", result);
    return 0;
}

float calculateSum(float age[]) {

  float sum = 0.0;

  for (int i = 0; i < 6; ++i) {
		sum += age[i];
  }

  return sum;
}

Example 2: array syntax in c++

int foo [] = { 16, 2, 77, 40, 12071 };

Example 3: array as parameter c++

void myFunction(int param[]) {
   .
   .
   .
}

Example 4: passing array to function c++ pointer

void generateArray(int *a, int si)
{
    for (int j = 0; j < si; j++)
        a[j] = rand() % 9;
}

int main()
{
    const int size=5;
    int a[size];

    generateArray(a, size);

    return 0;
}

Example 5: arrays in c++

#include <iostream>
#include <array> //for using std::array

int main()
{

	int example[5];//array on stack
	int* another = new int[5];//array on heap
	delete[] another;//freeing up memory on heap
	example[0] = 1;
	example[1] = 2;
	example[2] = 3;
	example[3] = 4;
	for (int i = 0; i < 5; i++) {
		example[i] = 2;
	}
	int* ptr = example;//arrays are just pointers to the begining of the block of memory
	example[2] = 5;
	*(ptr + 2) = 6;//adding 4+4 bytes to ptr
	std::cout << example[2] << std::endl;//output => 6
	*(int*)((char*)ptr + 8) = 8;//adding 8 bytes to ptr using ptr arithmetic
	std::cout << example[2] << std::endl;//output => 8
	//std::array provide some additional functionality like bounce checking size checking but do have a performance overhead
	std::array<int,5> stda;//creating an array named stda of int 5 size
	std::cout << stda.size() << std::endl;//will output size of std::array ,output =>5   
    std::cin.get();
}

Example 6: array syntax in c++

int bar [5] = { 10, 20, 30 };