C novice, want to pour the elements in a vector with adding another vector, why not-CodePudding

#include
#include
using namespace std;

Int main ()
{
Vector Vec.
Vec. Push_back (1);
Vec. Push_back (2);
Vec. Push_back (3);
Vector Vec1;
For (unsigned I=vec. The size () - 1; I>=0; I -)
Vec1. Push_back (vec [I]);
return 0;
}

CodePudding user response:

 # include 
#include 
using namespace std; 

Int main () 
{
Vector Vec. 
Vec. Push_back (1); 
Vec. Push_back (2); 
Vec. Push_back (3); 
Vector Vec1; 
For (int I=vec. The size () - 1; I>=0; I -) 
Vec1. Push_back (vec [I]); 
for(int i=0; I & lt; Vec1. The size (); I++) 
Cout & lt; return 0; 
}

The output 3, 2, 1

Problem, unsigned integer, into a lot of positive 1-0, dead cycle, the program crash

CodePudding user response:

Upstairs said to, either with an int or use iterators

CodePudding user response:

 int main () 
{
Vector Vec. 
Vec. Push_back (1); 
Vec. Push_back (2); 
Vec. Push_back (3); 
Reverse (vec) the begin (), vec. The end ()); 
return 0; 
}

Reverse function in the STL algorithms library is used