Triangle Solver

codyjohnson3141 (2)
I am trying to make a program to perform the Law of Sines and the Law of Cosines. My code is here:

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

using namespace std;

int main()
{
    cout << "Alert: This program is strictly for radians only." << endl << endl;

    string scenario;
    cout << "What variables do you have? (abc, Aab, Aac, Abc, Bab, Bac, Bbc, Cab, Cac, Cbc, ABa, ABb, ABc, ACa, ACb, ACc, BCa, BCb, BCc)" << endl;
    cin >> scenario;

    if(scenario == "abc"){
        double sa;
        double sb;
        double sc;
        cout << "a = ";
        cin >> sa;
        cout << "b = ";
        cin >> sb;
        cout << "c = ";
        cin >> sc;
        double aa = acos(((sb * sb) + (sc * sc) - (sa * sa)) / (2 * sb * sc));
        double ab = acos(((sa * sa) + (sc * sc) - (sb * sb)) / (2 * sa * sc));
        double ac = acos(((sa * sa) + (sb * sb) - (sc * sc)) / (2 * sa * sb));
        cout << "A = " << aa << ", B = " << ab << ", C = " << ac << endl;
    } else if(scenario == "Aab") {
        double aa;
        double sa;
        double sb;
        cout << "A = ";
        cin >> aa;
        cout << "a = ";
        cin >> sa;
        cout << "b = ";
        cin >> sb;
        double ab = asin(sb * sin(aa) / sa);
        double ac = (2 * M_PI) - (aa + ab);
        double sc = (sa * sin(ac) / sin(aa));
        cout << "B = " << ab << ", C = " << ac << ", c = " << sc << endl;
    } else if(scenario == "Aac") {
        double aa;
        double sa;
        double sc;
        cout << "A = ";
        cin >> aa;
        cout << "a = ";
        cin >> sa;
        cout << "c = ";
        cin >> sc;
        double ac = asin(sc * sin(aa) / sa);
        double ab = (2 * M_PI) - (aa + ac);
        double sb = sa * sin(ab) / sin(aa);
        cout << "B = " << ab << ", C = " << ac << ", b = " << sb << endl;
    } else if(scenario == "Abc") {
        double aa;
        double sb;
        double sc;
        cout << "A = ";
        cin >> aa;
        cout << "b = ";
        cin >> sb;
        cout << "c = ";
        cin >> sc;
        double sa = sqrt((sb * sb) + (sc * sc) - (2 * sb * sc * cos(aa)));
        double ab = asin(sb * sin(aa) / sa);
        double ac = asin(sc * sin(aa) / sa);
        cout << "B = " << ab << ", C = " << ac << ", a = " << sa << endl;
    } else if(scenario == "Bab") {
        double ab;
        double sa;
        double sb;
		cout << "B = ";
		cin >> ab;
		cout << "a = ";
		cin >> sa;
		cout << "b = ";
		cin >> sb;
        double aa = asin(sa * sin(ab) / sb);
        double ac = (2 * M_PI) - (aa + ab);
        double sc = sqrt((sa * sa) + (sb * sb) - (2 * sa * sb * sin(ac)));
		cout << "A = " << aa << ", C = " << ac << ", c = " << sc << endl;
    } else if(scenario == "Bac") {
        double ab;
        double sa;
        double sc;
		cout << "B = ";
		cin >> ab;
		cout << "a = ";
		cin >> sa;
		cout << "c = ";
		cin >> sc;
        double sb = sqrt((sa * sa) + (sc * sc) - (2 * sa * sc * cos(ab)));
        double aa = asin(sa * sin(ab) / sb);
        double ac = asin(sc * sin(ab) / sb);
		cout << "A = " << aa << ", C = " << ac << ", b = " << sb << endl;
    } else if(scenario == "Bbc") {
        double ab;
        double sb;
        double sc;
		cout << "B = ";
		cin >> ab;
		cout << "b = ";
		cin >> sb;
		cout << "c = ";
		cin >> sc;
        double ac = asin(sc * sin(ab) / sb);
        double aa = (2 * M_PI) - (ab + ac);
        double sa = sqrt((sb * sb) + (sc * sc) - (2 * sb * sc * cos(aa)));
		cout << "A = " << aa << ", C = " << ac << ", a = " << sa << endl;
    } else if(scenario == "Cab") {
        double ac;
        double sa;
        double sb;
		cout << "C = ";
		cin >> ac;
		cout << "a = ";
		cin >> sa;
		cout << "b = ";
		cin >> sb;
		double sc = sqrt((sa * sa) + (sb * sb) - (2 * sa * sb * cos(ac)));
        double aa = asin(sa * sin(ac) / sc);
        double ab = asin(sb * sin(ac) / sc);
		cout << "A = " << aa << ", B = " << ab << ", c = " << sc << endl;
    } else if(scenario == "Cac") {
        double ac;
        double sa;
        double sc;
		cout << "C = ";
		cin >> ac;
		cout << "a = ";
		cin >> sa;
		cout << "c = ";
		cin >> sc;
        double aa = asin(sa * sin(ac) / sc);
        double ab = (2 * M_PI) - (aa + ac);
        double sb = sqrt((sa * sa) + (sc * sc) - (2 * sa * sc * cos(ab)));
		cout << "A = " << aa << ", B = " << ab << ", b = " << sb << endl;
    } else if(scenario == "Cbc") {
        double ac;
        double sb;
        double sc;
		cout << "C = ";
		cin >> ac;
		cout << "b = ";
		cin >> sb;
		cout << "c = ";
		cin >> sc;
        double ab = asin(sb * sin(ac) / sc);
        double aa = (2 * M_PI) - (ab + ac);
        double sa = sqrt((sb * sb) + (sc * sc) - (2 * sb * sc * cos(aa)));
		cout << "A = " << aa << ", B = " << ab << ", a = " << sa << endl;
    } else if(scenario == "ABa") {
        double aa;
        double ab;
        double sa;
		cout << "A = ";
		cin >> aa;
		cout << "B = ";
		cin >> ab;
		cout << "a = ";
		cin >> sa;
        double ac = (2 * M_PI) - (aa + ab);
        double sb = sa * sin(ab) / sin(aa);
        double sc = sa * sin(ac) / sin(aa);
		cout << "C = " << ac << ", b = " << sb << ", c = " << sc << endl;
    } else if(scenario == "ABb") {
        double aa;
        double ab;
        double sb;
		cout << "A = ";
		cin >> aa;
		cout << "B = ";
		cin >> ab;
		cout << "b = ";
		cin >> sb;
        double ac = (2 * M_PI) - (aa + ab);
        double sa = sb * sin(aa) / sin(ab);
        double sc = sb * sin(ac) / sin(ab);
		cout << "C = " << ac << ", a = " << sa << ", c = " << sc << endl;
    } else if(scenario == "ABc") {
        double aa;
        double ab;
        double sc;
		cout << "A = ";
		cin >> aa;
		cout << "B = ";
		cin >> ab;
		cout << "c = ";
		cin >> sc;
        double ac = (2 * M_PI) - (aa + ab);
        double sa = sc * sin(aa) / sin(ac);
        double sb = sc * sin(ab) / sin(ac);
		cout << "C = " << ac << ", a = " << sa << ", b = " << sb << endl;
    } else if(scenario == "ACa") {
        double aa;
        double ac;
        double sa;
		cout << "A = ";
		cin >> aa;
		cout << "C = ";
		cin >> ac;
		cout << "a = ";
		cin >> sa;
        double ab = (2 * M_PI) - (aa + ac);
        double sb = sa * sin(ab) / sin(aa);
        double sc = sa * sin(ac) / sin(aa);
		cout << "B = " << ab << ", b = " << sb << ", c = " << sc << endl;
    } else if(scenario == "ACb") {
        double aa;
        double ac;
        double sb;
		cout << "A = ";
		cin >> aa;
		cout << "C = ";
		cin >> ac;
		cout << "b = ";
		cin >> sb;
        double ab = (2 * M_PI) - (aa + ac);
        double sa = sb * sin(aa) / sin(ab);
        double sc = sb * sin(ac) / sin(ab);
		cout << "B = " << ab << ", a = " << sa << ", c = " << sc << endl;
    } else if(scenario == "ACc") {
        double aa;
        double ac;
        double sc;
		cout << "A = ";
		cin >> aa;
		cout << "C = ";
		cin >> ac;
		cout << "c = ";
		cin >> sc;
        double ab = (2 * M_PI) - (aa + ac);
        double sa = sc * sin(aa) / sin(ac);
        double sb = sc * sin(ab) / sin(ac);
		cout << "B = " << ab << ", a = " << sa << ", b = " << sb << endl;
    } else if(scenario == "BCa") {
        double ab;
        double ac;
        double sa;
		cout << "B = ";
		cin >> ab;
		cout << "C = ";
		cin >> ac;
		cout << "a = ";
		cin >> sa;
        double aa = (2 * M_PI) - (ab + ac);
        double sb = sa * sin(ab) / sin(aa);
        double sc = sa * sin(ac) / sin(aa);
		cout << "A = " << aa << ", b = " << sb << ", c = " << sc << endl;
    } else if(scenario == "BCb") {
        double ab;
        double ac;
        double sb;
		cout << "B = ";
		cin >> ab;
		cout << "C = ";
		cin >> ac;
		cout << "b = ";
		cin >> sb;
        double aa = (2 * M_PI) - (ab + ac);
        double sa = sb * sin(aa) / sin(ab);
        double sc = sb * sin(ac) / sin(ab);
		cout << "A = " << aa << ", a = " << sa << ", c = " << sc << endl;
    } else if(scenario == "BCc") {
        double ab;
        double ac;
        double sc;
		cout << "B = ";
		cin >> ab;
		cout << "C = ";
		cin >> ac;
		cout << "c = ";
		cin >> sc;
        double aa = (2 * M_PI) - (ab + ac);
        double sa = sc * sin(aa) / sin(ac);
        double sb = sc * sin(ab) / sin(ac);
		cout << "A = " << aa << ", a = " << sa << ", b = " << sb << endl;
    } else {
        cout << "Error.";
    }


    system("PAUSE");
    return 0;
}


When I compiled this and ran it, everything worked until else if(scenario == "Bab"). Then everything, including the else statement did not work. What is wrong?
codyjohnson3141 (2)
By the way, there were no compiler errors.
ciphermagi (807)
Define "did not work." Please answer your own question, where you ask "What is wrong?" It would be more appropriate to instruct you on how to fix it, but we can't help you if we don't know...what's wrong.
whitenite1 (1785)
@codyjohnson3141

When I tried compiling, I received errors..
1. Needed to add #include <string> for the scenario input.
2. M_PI was not declared. I then initialized it to float M_PI = 3.14186; Then it compiled and ran. Don't really know what M_PI, is supposed to equal. No problems even with "Bab", as an input.

I'm using Microsoft Visual C++ 2008 Express
Last edited on
Aramil of Elixia (772)
you don't need math.h but you need <string> this would look a lot better with switch and functions
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