Vector Issue

general
,
1

#include
#include
#include
using namespace std;

int main()

{

vector<char> v;

v.push_back('c');

cout<<v.size()<<"\n";

 int j; cin>>j;

for(int i=0;i<v.size()-j;++i) cout<<i<<" ";

}

The above code is working fine for (j<=size of vector) but as soon as j>size of vector , the code gets stuck in an infinite loop

I dont know the reason behind this.

Thanks in advance for your time and help

2

Use i<(int)v.size()-j condition.

This is not an infinite loop. v.size() is unsigned data type.

https://www.quora.com/What-is-the-difference-between-signed-and-unsigned-data-types

So unsigned -5 is very lage.

Try cout<<v.size()-5<<endl; and cout<<(int)v.size()-5<<endl; you will get to know difference.

3

Thanks @aryanc403, its working now but could you please tell me the error…I mean what’s the difference between v.size() and (int)v.size()

4

In short,
v.size() is unsigned int. So It does not take negative value. In case you assign -5 to an unsigned int. Instead of -5. It will store a large +ve value. Which when converted back to signed int will result in -5. By default int is signed int.