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Calculating distance in c++

  1. Nov 23, 2012 #1
    1. The problem statement, all variables and given/known data
    can some one tell me what I am doing wrong in this program. I am getting a
    error C2296: '^' : illegal, left operand has type 'double'
    error at line 10 where I do my distance calculations. I am using Microsoft Visual Studios 2008.




    2. Relevant equations
    The program is supposed to input the time in seconds and then use the formula
    distance = (g * time2)/2 where g = 9.81

    3. The attempt at a solution

    Code (Text):

    #include <iostream>
    using namespace std;
    int main()
    {
       double time, distance;

       cout << "Enter the time in seconds.\n";
       cin >> time;
       distance = (9.81*(time)^2)/2;
       cout << "Distance travelled under free fall is "<< distance <<" meters per second.";
    }
     
     
    Last edited by a moderator: Nov 23, 2012
  2. jcsd
  3. Nov 23, 2012 #2

    Mark44

    Staff: Mentor

    You are using ^ as an exponentiation operator - there is no such exponentiation operator in any C-based language (including C++ and C#). The ^ operator is the bitwise "exclusive or" operator.

    Rewrite your assignment statement like so:
    Code (Text):

       distance = (9.81*time*time)/2;
     
     
  4. Nov 23, 2012 #3
    ^ is bitwise exclusive or
     
  5. Nov 23, 2012 #4
    Really? well thanks for the help
     
  6. Nov 23, 2012 #5
    So you know, if you need to do more complicated exponents, e.g. x^(2.3), you could include <cmath> and use the "pow()" function. Then instead of writing x^y, you would write pow(x,y). However, when you're just doing something like x^2, it's easier to just use x*x.
     
  7. Nov 23, 2012 #6
    I know about cmath I didn't add it to my program because I was under the impression I could just use ^ to represent exponent. Thanks for the help
     
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