Thread: Help!A simple question...

hi,i am just a novice to cpp programming.
here is a simple program to store 25 floating-numbers using a vector and then output all the elements in the vector.
when i excute it , some problem arise and i don't know why
Could anyone tell me why???thx~~~

Code:

// This program asks user to input 25 floating numbers and then output them

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

int main(){
	vector<float> v;
	int i=0;
	while(i<3){
		cin >> v[i] ;
		i++;
	}
	cout << "\n";

	cout << v[0] << endl;
	
	for(int j=0;j<v.size();j++){
		cout << v[j] << endl;
	}

	return 0;
}//