vector issue

**Micko** · 02-28-2004

Code:

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

typedef vector<int> intVector;

int main()
{
	intVector vInt1(5);
	vInt1[0]=1;
	cout<<vInt1.size()<<endl;
	cout<<vInt1.capacity();
	return 0;
}

Output is:
5
5
which is supprising (at least for me)
I was expecting 1 5
Druring compiling I get two following warnings:

conversion from 'size_t' to 'unsigned int', possible loss of data

both for cout
I can get rid of them by casting to unsigned int
If someone can explain output.
whati is the difference between size() and capacity()

**laserlight** · 02-28-2004

size() should give the number of elements, and capacity() the max number before more space must be allocated.

Maybe this would be clearer?

Code:

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

typedef vector<int> intVector;

int main()
{
	intVector vInt1;
	vInt1.reserve(5);
	vInt1.push_back(1);
	vInt1.push_back(0);
	cout<<vInt1.size()<<endl;
	cout<<vInt1.capacity();

	return 0;
}

I suspect that the reason for the warning is that the constructor doesnt accept a single integer as an argument.

**Micko** · 02-28-2004

It's working, thanks man

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