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#include <unistd.h>
 
void star(int sz)
{
    int i = 1;
    while(i <= sz)
    {
    	freopen<<"*";
        i++;
    }
}
void space(int rnb)
{
    int i = 1;
    while(i <=rnb )
    {
        freopen<<" ";
        i++;
    }
}
 
void    sastantua(int _size)
{
    int     k;
    int     i;
    int     j;
    int     s;
    int     mp;
    int     cr;
    int     rnb=(_size*(_size+2));
 
    k = 3;
    j = 0;
    s = 1;
    mp = 4;
    cr = 0;
 
    while (j < _size)
    {
        i = 0;
        while (i < k)
        {
            space(rnb);
            rnb--;
            freopen<<"/";
            star(s);
            freopen<<"\\";
            freopen<<endl;
            s+=2;
            i++;
        }
        s+=mp;
        cr++;
        rnb-=2;
        if(cr == 2)
        {
            mp+=2;
            cr=0;
        }
 
        //freopen<<endl;
        k++;
        j++;
    }
}
int main()
{
    sastantua(8);
    return 0;
}

prog.c: In function ‘star’:
prog.c:8:6: error: ‘freopen’ undeclared (first use in this function)
      freopen<<"*";
      ^~~~~~~
prog.c:8:6: note: each undeclared identifier is reported only once for each function it appears in
prog.c: In function ‘space’:
prog.c:17:9: error: ‘freopen’ undeclared (first use in this function)
         freopen<<" ";
         ^~~~~~~
prog.c: In function ‘sastantua’:
prog.c:45:13: error: ‘freopen’ undeclared (first use in this function)
             freopen<<"/";
             ^~~~~~~
prog.c:48:22: error: ‘endl’ undeclared (first use in this function)
             freopen<<endl;
                      ^~~~

Standard output is empty