Question

How to calculate float array size in C++

Answer 1

#include <iostream>

int main(void)
{
	float arr[] = { 3.14, 2.2, 9.7, 1.17, 5.55 };
	int size = (sizeof(arr) / sizeof(*arr));

	std::cout << "Size = " << size << std::endl;

	return(0);
}



/*
run:

Size = 5

*/

 

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Answer 2

#include <iostream>
#include <array>

int main(void)
{
	std::array<float, 5> arr = { 3.14, 2.2, 9.7, 1.17, 5.55 };

	std::cout << "Size = " << arr.size() << std::endl;
	std::cout << "Size = " << sizeof(arr)/sizeof(arr[0]) << std::endl;

	return(0);
}



/*
run:

Size = 5
Size = 5

*/

 

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Answer 3

#include <iostream>

int main(void)
{
	float arr[] = { 3.14, 2.2, 9.7, 1.17, 5.55 };
	int size = (sizeof(arr) / sizeof(arr[0]));

	std::cout << "Size = " << size << std::endl;

	return(0);
}



/*
run:

Size = 5

*/

 

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