stuck in a simple program :( (area)

[im abcd]

so i decided to make a program in which u have area given and base/height etc .

so lets say

the sum is
area=11.6
base=?
height=2.9

the ans should be...AREA of triangle = 1upon2*b*h
11.6=1/2*b*2.9
h=11.6/2.9*2 = 8
so i am really confused how to make a program which will do something like this

like i cant declare cin because it wont take decimals ? ?:((

so how can i do it

# include <iostream>
# include <string>

using namespace std;
int main ()
{
    int a ,b,c;
    string mystr;
    cout <<"area to find breadth or height of a triangle " << endl;
    cout << "enter ur breadth /height " << endl;
getline (cin,mystr); 
cout <<" enter ur area" <<endl;
getline ( cin,mystr);
cout << " the ans is " << ?? ? ? << endl;
scanf ("%d%",&c);
return 0;
}

please tell me what can i put in the question marks ..or what other methods to create such programs

[hamsterman]

you should see a tutorial of some kind..

anyway. contemplate this:

#include <iostream>

int main(){
    float a;
    std::cout << "Enter a number a = ";
    std::cin >> a;
    std::cout << "2a = " << 2*a;
    std::cin.ignore().get();
    return 0;
}

[im abcd]

wow didnt understood what u told just then .. wouldnt it just multiply a with 2 ?

[hamsterman]

it would ask you to enter an integer and then print twice as much.
the point was to show integer input. you seemed not to know how that is done.

[kaduuk]

point being, cin does take actually take fractioned numbers :) It doesn't take whole sentences (or anything after the space/ enter).

Just use the right variable type :)

[im abcd]

omg!! .. . lolz my bad ..how did i mis looked ..ok problem solved thanks :)))