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Whats wrong with my code???

JEvans1234 (17)
Basically I've been coding for about 3 weeks, I am creating a calculator so I can do a lot more than I can on a normal calculator. I haven't been working on it long and have made a lot of progress. The standard Calculations are working fine when i run them. I have worked my way through part of Trigonometry but I thought I'd try it out to see if it works. So I thought I'd try to Cos(63) which returned an answer of 0.985897. I then tried to type it in on a calculator to see if it returned the same result, but to my dismay it showed on the calculator, the answer to be 0.453990. can anyone see why it is wrong??? 

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#include <iostream>
#include <cmath>
#include <math.h>

using namespace std;

int main()

{

         double firstNumber = 0.0;
         double secondNumber = 0.0;
         char operation =' ';
         double asin(double x);

do
{
    int M;
     cout << "welcome to Calculator++." << endl;
     cout << " " << endl;
     cout << "Select Operation" << endl;
     cout << "1. Standard calculator operations" << endl;
     cout << "2. Trigonometry" << endl;
     cout << "3. Statistics" << endl;

    cin >> M;

     if ( M == 1 ){
        cout << " " << endl;
        cout << "1. Addition" << endl;
        cout << "2. Subtraction" << endl;
        cout << "3. Multiplication" << endl;
        cout << "4. Division" << endl;
        cout << "5. Square a number" << endl;
        cout << "6. Cube a number" << endl;
        cout << "7. Exponent's ( X^n)" << endl;
        cout << "8. Squareroot" << endl;
        cout << "9. Cuberoot" << endl;
        cout << "10. Log [log10(x)]" << endl;
        cout << "11. Finding the length of a hypotenuse" << endl;


        {
            int Op;

                cout << " " << endl;
                cout << "Enter first Number" << endl;
                cin>>firstNumber;
                cout << " " << endl;
                cout << "Enter Operation number (1 to 11)" << endl;
                cin>>Op;
                cout << " " << endl;
                cout << "Enter second Number (enter zero for operation 5, 6, 8, 9 & 10)" << endl;
                cin>>secondNumber;
                cout << " " << endl;

                if ( Op == 1){
                    cout << "the answer is..."<<firstNumber<<"+"<<secondNumber<<"="<<(firstNumber+secondNumber) << endl;
                }
                if ( Op == 2){
                    cout << "the answer is..."<<firstNumber<<"-"<<secondNumber<<"="<<(firstNumber-secondNumber) << endl;
                }
                if ( Op == 3){
                    cout << "the answer is..."<<firstNumber<<"*"<<secondNumber<<"="<<(firstNumber*secondNumber) << endl;
                }
                if ( Op == 4){
                    cout << "the answer is..."<<firstNumber<<"/"<<secondNumber<<"="<<(firstNumber/secondNumber) << endl;
                }
                if ( Op == 5){
                    cout << "the answer is..."<<firstNumber<<"*"<<firstNumber<<"="<<(firstNumber*firstNumber) << endl;
                }
                if ( Op == 6){
                    cout << "the answer is..."<<firstNumber<<"*"<<firstNumber<<"*"<<firstNumber<<"="<<(firstNumber*firstNumber*firstNumber) << endl;
                }
                if ( Op == 7){
                    cout << "the answer is..."<<std::pow(firstNumber, secondNumber) << endl;
                    break;
                }
                if ( Op == 8){
                    cout << "the answer is..."<<std::sqrt(firstNumber) << endl;
                    break;
                }
                if ( Op == 9){
                    cout << "the answer is..."<<std::cbrt(firstNumber) << endl;
                    break;
                }
                if ( Op == 10){
                    cout << "the answer is..."<<std::log10(firstNumber) << endl;
                    break;
                }
                if ( Op == 11){
                    cout << "the answer is..."<<std::hypot(firstNumber,secondNumber) << endl;
                    break;
                }
        return 0;
        }
     }

     if ( M == 2 ){
        cout << "1. Cos(angle)" << endl;
        cout << "2. Sin(angle)" << endl;
        cout << "3. Tan(angle)" << endl;
        cout << "4. Sine (find an angle)" << endl;
        cout << "5. Sine (find a length)" << endl;
        cout << "6. Cosine (find an angle)" << endl;
        cout << "7. Cosine (find a length)" << endl;
        cout << "8. Degrees to Raidians" << endl;
        cout << "9. Radians to Degrees" << endl;
        cout << "10. Arc Length" << endl;
        cout << "11. Area of a Sector" << endl;
        cout << "12. Area of a segment in a circle" << endl;
     }
     {
         int Op1;
         double angle;
         double angleA;
         double angleB;
         double angleC;
         int lengtha;
         int lengthb;
         int lengthc;
         const double PI = 3.1415926535897932385;


            cout << " " << endl;
            cout << "Enter Operation number (1 to 12)" << endl;
            cin>>Op1;
            cout << " " << endl;

            if ( Op1 == 1){
                cout << "Enter angle" << endl;
                cin>>angle;
                cout << " " << endl;
                cout << "the answer is..." <<cos(angle) << endl;
                break;
            }
            if ( Op1 == 2){
                cout << "Enter angle" << endl;
                cin>>angle;
                cout << " " << endl;
                cout << "the answer is..." <<sin(angle) << endl;
                break;
            }
            if ( Op1 == 3){
                cout << "Enter angle" << endl;
                cin>>angle;
                cout << " " << endl;
                cout << "the answer is..." <<tan(angle) << endl;
                break;
            }
            if ( Op1 == 4){
                cout << "Enter angle A" << endl;
                cin>>angleA;
                cout << " " << endl;
                cout << "Enter length a" << endl;
                cin>>lengtha;
                cout << " " << endl;
                cout << "Enter length b" << endl;
                cin>>lengthb;
                cout << " " << endl;
                cout << "Angle B is " << (180.0/PI)*asin(sin(angleA*PI/180.0) * lengthb / lengtha) << endl;
                break;
            }



     }

     if ( M == 3 ){
        cout << "1. " << endl; //*

        cout << "2. " << endl;
        cout << "3. " << endl;
        cout << "4. " << endl;
        cout << "5. " << endl;
        cout << "6. " << endl;
        cout << "7. " << endl;

        return 0;
     }
} while (true);

}
keskiverto (10402)
JEvans1234 (17)
ive put this in:

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2
3
 
double cos (      double x );
float cos (       float x );
long double cos ( long double x );


but still no luck
Chervil (7320)
By default the built-in trig functions work in radians. If you want to use degrees, first convert the user input from degrees to radians before calling the cos() function.

You should not need to declare the functions yourself, they are already declared in the <cmath> header.

Last edited on
JEvans1234 (17)

By default the built-in trig functions work in radians. If you want to use degrees, first convert the user input from degrees to radians before calling the cos() function.

You should not need to declare the functions yourself, they are already declared in the <cmath> header.



Thank you so much, i've got it working now
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