I have got to create a simple calculator in a college level intro to c prog class, my calculator must be able to do division multiplication addition subtraction using whole numbers. Any ideas on what i should do? please help

http://www.daniweb.com/forums/announcement118-2.html

Show us what you've got so far. If you're totally clueless about what you've to do, i'll give you a head start. Here's what the program should do:

1. Promt the user for a choice. (1.addition 2. subtraction 3. multiplication and so on)
2. Read the choice using scanf()
3. Use switch case to select the appropriate choice. (The cases will be addition, subtraction...)
4. If necessary enclose the code in a while loop to let the user do as many operations as he wishes. (a default case can be used to exit the program)

thanks i am completly clueless but i should be able to get started but i will for sure be back to you when i get going

Write a while loop that loops indefinitely while the user does not enter a specific value. Inside that while loop, you should simply print out something like "Enter your calculation or enter X to quit the program." Then, it should read in the user's input using scanf (might be other alternatives, I don't remember). If the input doesn't indicate that the user wants to quit, you then have two options as far as your programs design goes:

You can allow the user to input a full sequence that he/she wants your program to do the arithmetic for. For example, 5 x 4. This will be much harder because you will have to call a function to parse the input, then do the arithmetic. Or, you can display menu choices according to the rules for inputting the stuff to calculate. For example, you could say "Enter 1 if you want to multiply stuff". Then, if the user types 1, you could output: Enter the first number to be multiplied. (And after they do that)... Now enter the second number to multiply it with. Etc.

Hopefully that is helpful.

i have got the program for the calculator using graphics . i think it would really help u..

#include"graphics.h"
#include"dos.h"
#include"stdio.h"
#include"math.h"
union REGS i,o;
char text[35][25]={
"7","8","9","*","4","5","6","/","1","2","3","+","0","00",".","-","M","M+",
"M-","+/-","MR","MC","x^2","sr","OFF","AC","CE","="};

int s=0,k=0,pass,op,prop,newnum=1,bt,memo=1,d=0,sq;
long double num=0,accum,m;
void normalbutton(int,int,int,int,char *);
void main()
{
int gd=DETECT,gm,x1,x2,y1,y2,i,j,maxx,maxy,x,y,button;
initgraph(&gd,&gm,"");
if(initmouse()==0)
 {
  closegraph();
  restorecrtmode();
  printf(" Mouse driver not loded");
  exit(1);
}
setcolor(2);
gotoxy(20,10);
printf("WELCOME TO ISTE
");
gotoxy(20,14);
printf("press any key to continue.......
");
getch();
cleardevice();
showmouseptr();
movemouseptr(&x,&y);
setcolor(15);
rectangle(198,140,417,163);
rectangle(199,141,418,164);
rectangle(197,139,416,162);
rectangle(185,130,430,450);
rectangle(184,129,431,451);
rectangle(182,127,433,454);
rectangle(181,126,434,453);
setfillstyle(SOLID_FILL,3);
//bar(200,142,415,161);
outtextxy(50,25,"A Calculator project in C presented by B.NARAYANA 
MOORTHY
AND  R.KARTHIK KEYAN");
outtextxy(200,100,"Press OFF button to exit....");
y1=140;
y2=160;
for(j=0;j<7;j++)
 {
  x1=200;
  x2=235;
  y1+=40;
  y2+=40;
for(i=0;i<4;i++)
{
   normalbutton(x1,x2,y1,y2,text[s]);
   s++;
   x1+=60;
   x2+=60;
   }
}
while(1)
{
getmousepos(&button,&x,&y);
y1=140;
y2=160;
for(j=0;j<7;j++)
 {
  x1=200;
  x2=235;
  y1+=40;
  y2+=40;
  for(i=0;i<4;i++)
  {
    if((x<x2&&x>x1)&&(y<y2&&y>y1))
    {
    if((button&1)==1)
     {
     gotoxy(28,10);
    bt=j*4+i;
    setcolor(11);
    outtextxy(x1+12,y1+7,text[j*4+i]);
    if(num>pow(10.0,18))
    exit();
    delay(10);
    delay(250);
    delay(10);
    switch (bt)
    {
    case  8 :
        addnum(1);
        break;
    case  9 :
        addnum(2);
        break;
    case  10 :
        addnum(3);
        break;
    case  4 :
        addnum(4);
        break;
    case  5 :
        addnum(5);
        break;
    case  6 :
        addnum(6);
        break;
    case  0 :
        addnum(7);
        break;
    case  1 :
        addnum(8);
        break;
    case  2 :
        addnum(9);
        break;
    case  12 :
        addnum(0);
        break;
    case  11 :
        operation(1);   // plus
        break;
    case  15 :
        operation(2);    // minus
        break;
    case  3 :
        operation(3);    // multiplication
        break;
    case  7 :
        operation(4);     // division
        break;
    case 13:
        doublezero();
        break;
    case  14 :
        decimal();
        break;
    case 16:
        m=m;
        printf("%25.5Lf",m); //memory call
        break;
    case 20:
        printf("%25.5Lf",m);
        break;
    case 19:
        plusminus();
        break;
    case 17:
        m=m+num;       //memory plus
        break;
    case 18:
        m=m-num;       //memory minus
        break;
    case 21:
        clearm();
        break;
    case 22 :
        square();
        break;
    case 23:
        sqroot();
        break;
    case 24:
        hidemouseptr();
        setcolor(1);
        cleardevice();
        setcolor(14);
        outtextxy(225,200,"THANK YOU");
        delay(2000);
        exit();
        break;
    case 25:
        allclear();
        break;
    case 26:
        clear();
        break;
    case 27:
        num=operation(5);        //  equalto
        break;
     }
     setcolor(1);
    outtextxy(x1+12,y1+7,text[j*4+i]);
     }
   }
 x1+=60;

    x2+=60;
}
 }
 }
}
void normalbutton(int x1,int x2,int y1,int y2,char *text)
{
setcolor(15);
rectangle(x1-2,y1-2,x2+1,y2+1);
rectangle(x1-1,y1-1,x2+2,y2+2);
setcolor(5);
rectangle(x1,y1,x2+2,y2+2);
rectangle(x1,y1,x2+1,y2+1);
setfillstyle(SOLID_FILL,14);
bar(x1,y1,x2,y2);
setcolor(1);
outtextxy(x1+12,y1+7,text);
k++;
}

initmouse()
{
 i.x.ax=0;
 int86 (0x33,&i,&o);
 return(o.x.ax);
}
hidemouseptr()
{
     i.x.ax=2;
     int86(0x33,&i,&o);
     return 0;
}

showmouseptr()
{
 i.x.ax=1;
 int86(0x33,&i,&o);
 return 0;
}
getmousepos(int *button,int *x,int *y)
{
 i.x.ax=3;
 int86(0x33,&i,&o);
 *button=o.x.bx;
 *x=o.x.cx;
 *y=o.x.dx;
 return 0;
}
/* Move mouse ptr to x,y */
movemouseptr(int *x,int *y)
{
 i.x.ax=4;
 int86(0x33,&i,&o);
 o.x.cx=*x;
 o.x.dx=*y;
 return 0;
}
addnum(int pass)
{   if(sq)
    newnum=1;

    if(newnum)
      {      if(d)
    {
      num=pass/(pow(10.0,d));
      d++;
      newnum=0;
    }
     else
    {  num=pass;
       newnum=0;
    }
      }
    else
    {
    if(d)
    {
       if(num<0)
        num=num-pass/(pow(10.0,d));
       else
        num=num+pass/(pow(10.0,d));
      d++;
    }
    else
    {
    num=num*10+pass;
    }
    }
 printf("%25.5Lf",num);
 return ;
}
operation(int opr)
{  long double pnum;
   pnum=num;

   if(newnum && (prop != 5) && memo)
   {
   }
   else
  {  newnum=1;
     d=0;
     sq=0;
     switch(prop)
    {
     case 1:
        accum=accum+pnum;
        break;
     case 2:
        accum=accum-pnum;
        break;
     case 3:
        accum=accum*pnum;
        break;
     case 4:
        accum=accum/pnum;
        break;
     default:
       accum=pnum;
     }
  }
    prop=opr;
    num=accum;
 printf("%25.5Lf",num);
 return num;
}
allclear()
{
 sq=0;
 accum=0;
 num=0;
 d=0;
 newnum=1;
 printf("%25.5Lf",num);
 return;
}
plusminus()
{ if(num!=0)
  { num*=-1;
    printf("%25.5Lf",num);
  }
  return;
}
clearm()
{
m=0;
//printf("%25.5Lf",m);
return;
}
decimal()
{
 if(!d)
 {
 d=1;
    if(newnum==1)
    {
     num=0;
    }
  printf("%25.5Lf",num);
  }
  return;
}
square()
{
sq=1;
 num*=num;
 printf("%25.5Lf",num);
return;
}
sqroot()
{ sq=1;
 num=pow(num,0.5);
 printf("%25.5Lf",num);
return;
}
doublezero()
{
 if(d)
   {
     d++;
     d++;
   }
 else
  num*=100;
 printf("%25.5Lf",num);
 return;
}
clear()
{
num=0;
printf("%25.5Lf",num);
return;
}

Edited 3 Years Ago by Nick Evan: Fixed formatting

> i think it would really help u..
No it won't.

>i have got the program for the calculator using graphics .
Why did you not just paste the link where you got it?

The least you could have done it is to use proper code tagging.

i didnot had the the linki had the program The program pasted needed to had some modifications which can easy done by ne1...if u r not able to do the so....then here is the edited one...

#include<graphics.h>
#include<dos.h>
#include"dos.h"
#include"stdio.h"
#include"math.h"
#include<process.h>
#include<conio.h>
union REGS i,o;

char text[35][25]={"7","8","9","*","4","5","6","/","1","2","3","+","0","00",".","-","M","M+","M-","+/-","MR","MC","x^2","sr","OFF","AC","CE","="};

int s=0,k=0,pass,op,prop,newnum=1,bt,memo=1,d=0,sq;
long double num=0,accum,m;
void normalbutton(int,int,int,int,char *);
void normalbutton(int x1,int x2,int y1,int y2,char *text)
{
setcolor(15);
rectangle(x1-2,y1-2,x2+1,y2+1);
rectangle(x1-1,y1-1,x2+2,y2+2);
setcolor(5);
rectangle(x1,y1,x2+2,y2+2);
rectangle(x1,y1,x2+1,y2+1);
setfillstyle(SOLID_FILL,14);
bar(x1,y1,x2,y2);
setcolor(1);
outtextxy(x1+12,y1+7,text);
k++;
}

initmouse()
{
 i.x.ax=0;
 int86 (0x33,&i,&o);
 return(o.x.ax);
}
hidemouseptr()
{
	 i.x.ax=2;
	 int86(0x33,&i,&o);
	 return 0;
}

showmouseptr()
{
 i.x.ax=1;
 int86(0x33,&i,&o);
 return 0;
}
getmousepos(int *button,int *x,int *y)
{
 i.x.ax=3;
 int86(0x33,&i,&o);
 *button=o.x.bx;
 *x=o.x.cx;
 *y=o.x.dx;
 return 0;
}
/* Move mouse ptr to x,y */
movemouseptr(int *x,int *y)
{
 i.x.ax=4;
 int86(0x33,&i,&o);
 o.x.cx=*x;
 o.x.dx=*y;
 return 0;
}
addnum(int pass)
{   if(sq)
	newnum=1;

	if(newnum)
	  {      if(d)
	{
	  num=pass/(pow(10.0,d));
	  d++;
	  newnum=0;
	}
	 else
	{  num=pass;
	   newnum=0;
	}
	  }
	else
	{
	if(d)
	{
	   if(num<0)
		num=num-pass/(pow(10.0,d));
	   else
		num=num+pass/(pow(10.0,d));
	  d++;
	}
	else
	{
	num=num*10+pass;
	}
	}
 printf("%25.5Lf",num);
 return(0) ;
}
operation(int opr)
{  long double pnum;
   pnum=num;

   if(newnum && (prop != 5) && memo)
   {
   }
   else
  {  newnum=1;
	 d=0;
	 sq=0;
	 switch(prop)
	{
	 case 1:
		accum=accum+pnum;
		break;
	 case 2:
		accum=accum-pnum;
		break;
	 case 3:
		accum=accum*pnum;
		break;
	 case 4:
		accum=accum/pnum;
		break;
	 default:
	   accum=pnum;
	 }
  }
	prop=opr;
	num=accum;
 printf("%25.5Lf",num);
 return num;
}
allclear()
{
 sq=0;
 accum=0;
 num=0;
 d=0;
 newnum=1;
 printf("%25.5Lf",num);
 return(0);
}
plusminus()
{ if(num!=0)
  {	num*=-1;
	printf("%25.5Lf",num);
  }
  return(0);
}
clearm()
{
m=0;
//printf("%25.5Lf",m);
return(0);
}
decimal()
{
 if(!d)
 {
 d=1;
	if(newnum==1)
	{
	 num=0;
	}
  printf("%25.5Lf",num);
  }
  return(0);
}
square()
{
sq=1;
 num*=num;
 printf("%25.5Lf",num);
return(0);
}
sqroot()
{ sq=1;
 num=pow(num,0.5);
 printf("%25.5Lf",num);
return(0);
}
doublezero()
{
 if(d)
   {
	 d++;
	 d++;
   }
 else
  num*=100;
 printf("%25.5Lf",num);
 return(0);
}
clear()
{
num=0;
printf("%25.5Lf",num);
return(0);
}
void main()
{
int gd=DETECT,gm,x1,x2,y1,y2,i,j,maxx,maxy,x,y,button;
initgraph(&gd,&gm,"g:\\tc\\bgi");
if(initmouse()==0)
 {
  closegraph();
  restorecrtmode();
  printf(" Mouse driver not loded");
  exit(0);
}
setcolor(2);
gotoxy(20,10);
printf("WELCOME TO ISTE");
gotoxy(20,14);
printf("press any key to continue.......");
getch();
cleardevice();
showmouseptr();
movemouseptr(&x,&y);
setcolor(15);
rectangle(198,140,417,163);
rectangle(199,141,418,164);
rectangle(197,139,416,162);
rectangle(185,130,430,450);
rectangle(184,129,431,451);
rectangle(182,127,433,454);
rectangle(181,126,434,453);
setfillstyle(SOLID_FILL,3);
//bar(200,142,415,161);
outtextxy(50,25,"A Calculator project in C presented by MR.AJAY HIMATSINGKA");
outtextxy(200,100,"Press OFF button to exit....");
y1=140;
y2=160;
for(j=0;j<7;j++)
 {
  x1=200;
  x2=235;
  y1+=40;
  y2+=40;
for(i=0;i<4;i++)
{
   normalbutton(x1,x2,y1,y2,text[s]);
   s++;
   x1+=60;
   x2+=60;
   }
}
while(1)
{
getmousepos(&button,&x,&y);
y1=140;
y2=160;
for(j=0;j<7;j++)
 {
  x1=200;
  x2=235;
  y1+=40;
  y2+=40;
  for(i=0;i<4;i++)
  {
	if((x<x2&&x>x1)&&(y<y2&&y>y1))
	{
	if((button&1)==1)
	 {
	 gotoxy(28,10);
	bt=j*4+i;
	setcolor(11);
	outtextxy(x1+12,y1+7,text[j*4+i]);
	if(num>pow(10.0,18))
	exit(0);
	delay(10);
	delay(250);
	delay(10);
	switch (bt)
	{
	case  8 :
		addnum(1);
		break;
	case  9 :
		addnum(2);
		break;
	case  10 :
		addnum(3);
		break;
	case  4 :
		addnum(4);
		break;
	case  5 :
		addnum(5);
		break;
	case  6 :
		addnum(6);
		break;
	case  0 :
		addnum(7);
		break;
	case  1 :
		addnum(8);
		break;
	case  2 :
		addnum(9);
		break;
	case  12 :
		addnum(0);
		break;
	case  11 :
		operation(1);   // plus
		break;
	case  15 :
		operation(2);    // minus
		break;
	case  3 :
		operation(3);    // multiplication
		break;
	case  7 :
		operation(4);     // division
		break;
	case 13:
		doublezero();
		break;
	case  14 :
		decimal();
		break;
	case 16:
		m=m;
		printf("%25.5Lf",m); //memory call
		break;
	case 20:
		printf("%25.5Lf",m);
		break;
	case 19:
		plusminus();
		break;
	case 17:
		m=m+num;       //memory plus
		break;
	case 18:
		m=m-num;       //memory minus
		break;
	case 21:
		clearm();
		break;
	case 22 :
		square();
		break;
	case 23:
		sqroot();
		break;
	case 24:
		hidemouseptr();
		setcolor(1);
		cleardevice();
		setcolor(14);
		outtextxy(225,200,"THANK YOU");
		delay(2000);
		exit(0);
		break;
	case 25:
		allclear();
		break;
	case 26:
		clear();
		break;
	case 27:
		num=operation(5);      	 //  equalto
		break;
	 }
	 setcolor(1);
	outtextxy(x1+12,y1+7,text[j*4+i]);
	 }
   }
 x1+=60;

	x2+=60;
}
 }
 }
}
This article has been dead for over six months. Start a new discussion instead.