Illegal exponent operator, how do i fix this?

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  1. #1
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    Illegal exponent operator, how do i fix this?

    run compiler w/o precompiled headers

    Bug: It says my exponent operator is incorrect, how do i fix this? Thanks

    #include <iostream>
    using namespace std;

    //Math functions
    #include <cmath>

    //Function prototype compute_range()
    double compute_range(double angle, double velocity);

    //Function prototype show_results()
    void show_results(double range);

    int main()
    {

    //boolean condition set to false
    bool cont = false;

    //Intialized variables
    char answer = 'y';
    double angle, velocity, range;

    //do while loop
    do{

    cout << "Please input an angle in degrees: ";
    cin >> angle;
    cout << endl;
    cout << "Please input velocity in meters per second: ";
    cin >> velocity;
    cout << endl;

    range = compute_range(angle, velocity);

    show_results(range);

    cout << "Continue (y/n) ? ";
    cin >> answer;
    cont = (answer == 'y');

    //End while
    }while(cont);


    return 0;
    }
    /************************************************** */
    //Function call computer_range()
    double compute_range(double angle, double velocity){

    double const GRAVITY = 9.8;
    double range;

    range = sin(2 * angle) * velocity^2 / GRAVITY;

    return(range);
    }
    /************************************************** */

    /*************************************/
    //Function call show_results()
    void show_results(double range){

    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(1);
    cout << "The range is: " << range;

    return;
    }
    /*************************************/

  2. #2
    l'Anziano DavidP's Avatar
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    Plano, Texas, United States
    Posts
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    the ^ is not the exponent operator in C++. Use the pow() function. In this case, you would do: pow(velocity, 2). It is in math.h.

    If you wanted to make the ^ and exponent operator, you would have to overload it, like this:

    double operator ^ (double lhs, double rhs)
    {
    return pow(lhs, rhs);
    }

    THEN you could say velocity^2
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    "Circular logic is good because it is."

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