calc.cpp

#include <iostream>
#include <math.h>
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <unistd.h>
#include <cstdlib>
#include <string.h>

using namespace std;




void quad(void)
{

  double a = 0, b = 0, c = 0;
    clrscr();
    cout<<"\xDB";
cout<<" please input A\n";
    cin>>a;
cout<<"please input B\n";
    cin>>b;
cout<<"please input C\n";
    cin>>c;
    system("cls");
    cout<<"Your equation is ("<<a<<")x^2 + ("<<b<<")x + ("<<c<<")";
    cin.get();
    cin.get();
    clrscr();
double x1=(-b + sqrt(pow(b,2) - 4*(a*c)))/(2*a);
double x2=(-b - sqrt(pow(b,2) - 4*(a*c)))/(2*a);

    double d = (pow(b,2) - 4*(a*c));
  if(d > 0) {


cout<<"\nYour (X)-intercepts are : \n"<<x1<<" and "<<x2;
        cin.get();

   }
  else  if(d == 0){

  cout<<"You have one (X)-intercept";
        cin.get();

}
  else  if (d < 0){
       cout<<"You do not have an (X)-intercept";
        cin.get();

    }

}


void add (void)
{
double a = 0, b = 0, c = 0;
    clrscr();
cout<<" Please input the two numbers you would \n like to add\n input :\n ";
    cin>>a;
    cout<<"\n ";
    cin>>b;

c = a+b;
    cout<<"\n The answer is "<<c;
    cin.get();
    cin.get();

}

void sub (void)
{
double a = 0, b = 0, c = 0;
    clrscr();
cout<<" Please input the two numbers you would \n like to subtract\n input :\n ";
    cin>>a;
    cout<<"\n ";
    cin>>b;

c = a-b;
    cout<<"\n The answer is "<<c;
    cin.get();
    cin.get();

}


void trig (void){
double a = 0, b = 0, c = 0;
    clrscr();
cout<<"please input A";
    cin>>a;
cout<<"please input B";
    cin>>b;

    clrscr();
    c = sqrt(pow(b,2)+pow(a,2));
cout<<" Your answer is "<<c;
    cin.get();
    cin.get();
}

void perc (void)
{

    double number, percent, result;
    clrscr();
    cout<<"please input the base number :";
    cin>>number;
    clrscr();
    cout<<"please input your percent :";
    cin>>percent;

    result = number * 100;
    result = (result / 100) * percent;
    result /= 100;
    cout<<"your answer is "<<result;
    cin.get();
    cin.get();
}

void slope (void){
    clrscr();
    float y1, y2, m, x1, x2, b;
char x, y;


cout<<"Enter first X: ";
cin>> x1;
cout<<"Enter second X: ";
cin>> x2;
cout<<"Enter first Y: ";
cin>> y1;
cout<<"Enter second Y: ";
cin>> y2;

m=(y2-y1)/(x2-x1);
cout<<"The slope is: "<< m <<"\n";
cin.get();

b=y1-(m*x1);
cout<<"The y intercept is: "<< b <<"\n";
cout<<"The line equation is: "<< "y="<<m<<"x+"<<"("<<b<<")"<<"\n";
cin.ignore();
cin.get();
}

void prime (void){
 int i, n;
 cout <<" enter a possitive integer";
 cin>>n;
 for(i = 2; i <= n / 2; i++)
 {
    if(n % i == 1)
    {

        cout<<n;
        cin.get();

    }
 }
}

int main(){

   for(;;)
{
      clrscr();
cout<<" Please select what type of function \n you would like to use.\n 'q' - Quadratic Formula\n 'a' - Addition\n 's' - Subtraction\n 'p' - Percent\n 't' - Pythagorean theorem\n 'f' - Slope of a line\n Input :";
        char q;
        cin>>q;
        switch(q){

case 'q' :
   quad();
            break;
            break;
case 'a' :
   add();
            break;
            break;
case 's' :
   sub();
            break;
            break;
case 't' :
   trig();
            break;
            break;
case 'p' :
   perc();
            break;
            break;
case 'f' :
   slope();
            break;
case 'r' :
    prime();
            break;
default :
            clrscr();

        }
    }
}