Resizing a vector.

foo.cpp

#include <cstdio>                                                                                                                                                                                                                                               
#include <vector>                                                                                                                                                                                                                                               
int main(){                                                                                                                                                                                                                                                     
    int new_size = 3;                                                                                                                                                                                                                                           
    std::vector<int> blah;                                                                                                                                                                                                                                      
    blah.resize(new_size);                                                                                                                                                                                                                                      
    printf("%d\n", blah.size());                                                                                                                                                                                                                                
}