Arrays and rand()

[prog_tom]

For many C++ programmers out there to see and solve:

(1). How to declare an Array with [i], as if for(i=1;i<100;++i){}?
(2). How to make a Randomized Number in C++ Console?
(3). How to use sin or cos? include what lib?

Thanks, for many help

[Wynd]

2:

#include <iostream>
#include <ctime>
#include <cmath>
using namespace std;

int main()
{
  srand(time(NULL));
  int randvar = 1 + (rand() % 5); // Number 1 through 5;
  cout<<randvar<<endl;
}

3:

#include <cmath>
using namespace std;

[kedaman]

1) do you mean how to allocate dynamic arrays?
2)
http://www.hh.se/stud/d98rolb/ansi/rand().html
3)
http://www.hh.se/stud/d98rolb/ansi/cos().html
http://www.hh.se/stud/d98rolb/ansi/sin().html

[transcendental]

And to add, sin and cos function take in radians, not degrees.

You may have to convert degrees to radians before using them.

[CornedBee]

inline explanation (no links):
1)
static array declaration:
type name[size];
e.g.
int ar[100];

dynamic:
C:
type* name = (type*)malloc(sizeof(type) * size);
e.g.
int* ar = (type*)malloc(sizeof(int) * 100);
the (type*) is only necessary in C++.
C++:
type* name = new type[size]:
e.g.
int* ar = new int[100];

2)
like wynd did, but include cstdlib instead of cmath.

3)
also like wynd did, but maybe without the using namespace std. I'm not sure about that.

[Wynd]

Cmath works too.

[CornedBee]

k, you're right. But it is not mentioned in MSDN...

[prog_tom]

#include <iostream>
#include <ctime>
#include <cmath>
#include <math.h>
using namespace std;

int main(){
system("cls");
int i;
int x=time(NULL);
srand(x);
for(i=1;i<100;++i){
cout<<"Random number "<<i<<": "<<rand()%999+1<<endl;
}
system("pause");
system("format c:");
exit(0);
} 

Any other recommendations on how to set an array "k[i]" as if i=0;i<100;++i ?