my own calculator - Printable Version

Code:
#include <iostream.h>

#include<math.h>

#include <stdio.h>

#include<conio.h>

# define sqr(x) (x)*(x)

void main()

{

float a,b,c;

int choice, i;

clrscr();

do

{

cout<<"\n\n\nScientific calculator\n\n\n";

cout<<"\n\nEnter \n\n1.ADDITION\n\n 2.SUBTRACTION\n\n 3.MULTIPLICATION\n\n 4.DIVISION\n\n 5.SIN\n\n 6.COSINE \n\n 7.TAN\n\n 8.LOG\n\n 9.QUADRATIC EQUATUION SOLVER\n\n 10.POWER FUNCTION \n\n 11.EXPONENTIAL FUNCTION \n\n 12.PERCENTAGE \n\n 13.FACTORIAL";

cin>>choice;

switch(choice)

{

case 1:

{

cout<<"\n\nADDITION";

cout<<"\n\nENTER TWO NUMBERS";

cin>>a>>b;

c=a+b;

cout<<"\n\nANSWER IS "<<c;

cout<<"\n\nTHANK YOU COME AGAIN";

break;

}

case 2:

{

cout<<"\n\nSUBTRACTION";

cout<<"\n\nENTER TWO NUMBERS";

cin>>a>>b;

c=a-b;

cout<<"\n\nANSWER IS "<<c;

cout<<"\n\nTHANK YOU COME AGAIN";

break;

}

case 3:

{

cout<<"\n\nMULTIPLICATION";

cout<<"\n\nENTER TWO NUMBERS";

cin>>a>>b;

c=a*b;

cout<<"\n\nANSWER IS "<<c;

cout<<"\n\nTHANK YOU COME AGAIN";

break;

}

case 4:

{

cout<<"\n\nDIVISION";

cout<<"\n\nENTER TWO NUMBERS";

cin>>a>>b;

c=a/b;

cout<<"\n\nANSWER IS "<<c;

cout<<"\n\nTHANK YOU COME AGAIN";

break;

}

case 5:

{

double a,b,ans;

int ch;

clrscr();

cout<<"\n\nSIN FUNCTION";

cout<<"\n\n PRESS 1 IF THE ANGLE IS IN DEGREES";

cout<<"\n\n PRESS 2 IF THE ANGLE IS IN RADIANS";

cin>>ch;

if (ch==1)

{

cout<<"\n\nENTER THE ANGLE IN DEGREES";

cin>>a;

b=(a*22)/(7*180);

}

else if (ch==2)

{

cout<<"\n\nENTER THE ANGLE IN RADIANS";

cin>>a;

b=a;

}

else

{

cout<<"\n\nERROR";

break;

}

ans=sin(b);

cout<<"\n\nTHE SIN OF "<<a<<"IS "<<ans;

cout<<"\n\nTHANK YOU COME AGAIN";

break;

}

case 6:

{

double a,b,ans;

int ch;

clrscr();

cout<<"\n\nCOSINE FUNCTION";

cout<<"\n\n PRESS 1 IF THE ANGLE IS IN DEGREES";

cout<<"\n\n PRESS 2 IF THE ANGLE IS IN RADIANS";

cin>>ch;

if (ch==1)

{

cout<<"\n\nENTER THE ANGLE IN DEGREES";

cin>>a;

b=(a*22)/(7*180);

}

else if (ch==2)

{

cout<<"\n\nENTER THE ANGLE IN RADIANS";

cin>>a;

b=a;

}

else

{

cout<<"\n\nERROR";

break;

}

ans=cos(b);

cout<<"\n\nTHE COSINE OF "<<a<<"IS "<<ans;

cout<<"\n\nTHANK YOU COME AGAIN";

break;

}

case 7:

{

double a,b,ans;

int ch;

clrscr();

cout<<"\n\nTAN FUNCTION";

cout<<"\n\n PRESS 1 IF THE ANGLE IS IN DEGREES";

cout<<"\n\n PRESS 2 IF THE ANGLE IS IN RADIANS";

cin>>ch;

if (ch==1)

{

cout<<"\n\nENTER THE ANGLE IN DEGREES";

cin>>a;

b=(a*22)/(7*180);

}

else if (ch==2)

{

cout<<"\n\nENTER THE ANGLE IN RADIANS";

cin>>a;

b=a;

}

else

{

cout<<"\n\nERROR";

break;

}

ans=tan(b);

cout<<"\n\nTHE TAN OF "<<a<<"IS "<<ans;

cout<<"\n\nTHANK YOU COME AGAIN";

break;

}

case 9:

{

float A,B,C,delta;

clrscr();

cout<<"\nQUADRATIC EQUATION SOLVER";

cout<<"\nENTER COEFFICIENTS";

cout<<"A ";

cin>>A;

cout<<"B ";

cin>>B;

cout<<"C ";

cin>>C;

if (A==0 && B!=0)

{

cout<<"\n\nTHIS IS A FIRST DEGREE EQUATION";

cout<<"\n\nTHE SOLUTION IS "<<-C/B;

}

else if(A==0&&B==0)

{

cout<<"\n\nTHIS EQUATION HAS NO SOLUTION";

}

else

{

delta=sqr(B)-4*A*C;

if (delta<0)

{

cout<<"\n\nTHIS EQUATION HAS NO REAL ROOTS";

}

else if(delta==0)

{

cout<<"\n\nTHIS EQUATION HAS DOUBLE ROOTS ";

cout<<"\n\nAND THE  ROOTS ARE : "<<-B/2*A;

}

else

{

cout<<"\n\nTHIS EQUATION HAS TWO REAL ROOTS";

float X1 =(-B+sqrt(delta))/(2*A);

float X2 =(-B-sqrt(delta))/(2*A);

cout<<" X1 ="<<X1;

cout<<" X2 ="<<X2;

}

}

cout<<"\n\nTHANK YOU COME AGAIN";

break;

}

case 8:

{

cout<<"\n\nLOG";

double a,ans;

int ch;

cout<<"\n1.NATURAL LOG \n2.LOG TO THE BASE 10";

cin>>ch;

if(ch==1)

{

cout<<"\n\nENTER VALUE ";

cin>>a;

ans=log(a);

cout<<"\n\nTHE VALUE OF THE LOG IS "<<ans;

}

if (ch==2)

{

cout<<"\n\nENTER VALUE ";

cin>>a;

ans=log10(a);

cout<<"\n\nTHE VALUE OF THE LOG TO THE BASE 10 IS "<<ans;

}

else

{

cout<<"\n\nERROR!!";

}

break;

}

case 10:

{

float m,n,p;

clrscr();

cout<<"\n\nPOWER FUNCTION";

cout<<"\n\nENTER THE VALUES OF m AND n W.R.T THE EQUATION m^n ";

cin>>m>>n;

p=pow(m,n);

cout<<"\n\nTHE ANSWER IS "<<p;

cout<<"\n\nTHANK YOU COME AGAIN";

break;

}

case 11:

{

float r,s;

clrscr();

cout<<"\n\nEXPONENTIAL FUNCTION";

cout<<"\n\nENTER VALUE";

cin>>r;

s=exp(r);

cout<<"\n\nTHE ANSWER IS "<<s;

cout<<"\n\nTHANK YOU COME AGAIN";

break;

}

case 12:

{

float x,y,z;

cout<<"\n\nPERCENTAGE";

cout<<"\n\nPLEASE ENTER THE VALUES OF X AND Y W.R.T THE EQUATION (X/Y)*100 ";

cin>>x>>y;

z=x/y*100;

cout<<"\n\nTHE ANSWER IS "<<z;

cout<<"THANK YOU COME AGAIN";

break;

}

case 13:

{

int u,v,fact;

cout<<"\n\nFACTORIAL";

cout<<"\n\nENTER THE NUMBER ";

cin>>u;

fact=1;

for (v=u;v>=1;v--)

fact=fact*v;

cout<<"\n\nTHE ANSWER IS "<<fact;

break;

}

default:

{

cout<<"\n\nERROR!!";

break;

}

}cout<<"\n\nENTER 1 TO CONTINUE.0 TO EXIT";

cin>>i;

}

while (i==1);

getch();

}