Compiled error: 'was not declared in this scope'

When compiling this code, the compiler complains about the following error:

  

error : 'content' was not declared in this scope

When it is apparently declared as an input parameter in the macro function.

#include <iostream>
#define mostrar    (contenido) cout << "Resultado  " #contenido "==" << ":" << contenido << endl;
using namespace std;



int main()
{
    int ai[] = { 2,3 };
    int zl = ai[0] + ai[1];
    mostrar(zl);

    int* pt1 = ai;
    int z3 = *pt1;
    mostrar(z3);

    int* pt2 = ai;
    int z4 = *(++pt2);
    mostrar(z4);

    int *pt3 = ai;
    int z5 = *pt3 + *(++pt3);
    mostrar(z5);



    return 0;
}