CODEWITHSUNDEEP
c++arraysstringloopscount
YelizavetaYR
YelizavetaYR

Reputation: 1701

Using C++ how many characters are in a string array?

I have the below piece of code and I'm very confused by it. I'm trying to figure out how much memory (bytes of memory/space is actually being taken up by my partially filled array). I've got the below piece of code but I'm a bit confused.

If I declare a string array of 8 elements, and partially fill the elements with the two strings. The for loop will start at 0 and go until size of my array 32 possible bytes (assuming I need 4 bytes per string) divided by size of the first element in the array. That is returns 4 - the size of the element of the first string in the array. But that still doesn't tell me how many letters/characters are in that string.

I understand inside the loop we increment count when the value in the array doesn't equal a blank/null value. Giving us the total filled (non empty) positions in our array. However I still don't have a value for our actual amount of characters.

How does this tell us how many characters are in my strings? 

#include <iostream>
#include <string>
using namespace std;

int main() 
{
string test_array[8] = {"henry", "henry2"};
size_t count = 0;

for (size_t i = 0; i < sizeof(test_array)/sizeof(*test_array); i++) 
{

    cout << "NOT THE POINTER: "<<sizeof(test_array) << endl;
    cout << "POINTER: "<<sizeof(*test_array) << endl;

    if(test_array[i] != "")
        count ++;
}

int num_elem = sizeof(test_array)/sizeof(test_array[0]);
cout << num_elem << endl;
cout << count << endl;

return 0;
}

Upvotes: 0

Views: 2360

Answers (1)

NathanOliver
NathanOliver

Reputation: 180415

To know how many characters are in a std::string use the size() method.

Upvotes: 2

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