iomanip errors or ‘setw’ was not declared in this scope

Question

In this function:

#include <iostream>
using namespace std;

extern const int M;

void outnum(int* &arr)
{
    for (int i=0; i<M; i++)
        cout << setw(4) << arr[i];

    cout << endl;
}

I get an error

error: ‘setw’ was not declared in this scope
   cout << setw(4) << arr[i];
                 ^

When I try to include iomanip, during the compilation there appear a lot of lines like this:

/usr/bin/ld: /usr/lib/debug/usr/lib/i386-linux-gnu/crt1.o(.debug_info): relocation 0 has invalid symbol index 11

Is it something special for Ubuntu?

main file:

#include <iostream>
#include <locale>

extern const int M=5;
extern const int N=4;

int **makemas(int m, int n);
void output(int** &array, int m, int n);
int *number(int** &array, int n, int m);
void outnum(int* &arr);

int main()
{
int **a, **b;
int *anum, *bnum;

...

cout<<"  Number of minus elements in A:"<<endl;
outnum(anum);
cout<<"  Number of minus elements in B:"<<endl;
outnum(bnum);

return 0;
}

Answer 1

You need to add #include <iomanip> in order to use std::setw(). If you are getting errors on that, then something else is going on, either Ubuntu's STL is messed up, or something else is interfering with the compile.