How make a calculator in c?

Answer 1

#include

int main(){

int a, b, choice;

printf("This program implements a calculator\n");

do{

printf("Enter your choice:\n1-Addition\n2-Subtraction\n3-Multiplication\n4-Division\n5-Modulus\n6-Quit\t:");

scanf("%d", &choice);

switch(choice){

case 1: printf("Enter two numbers :");

scanf("%d%d", &a, &b);

printf("Sum = %d\n", a+b);

break;

case 2: printf("Enter two numbers :");

scanf("%d%d", &a, &b);

printf("Subtraction = %d\n", a-b);

break;

case 3: printf("Enter two numbers :");

scanf("%d%d", &a, &b);

printf("Product = %d\n", a*b);

break;

case 4: printf("Enter two numbers :");

scanf("%d%d", &a, &b);

printf("Quotient = %d\n", a/b);

break;

case 5: printf("Enter two numbers :");

scanf("%d%d", &a, &b);

printf("Remainder = %d\n", a%b);

break;

case 6: break;

default: printf("Invalid choice\n");

}

}while(choice != 6);

return 0;

}

Answer 2

#include<stdio.h>

#include<conio.h>

void main()

{

int a,b,c;

printf("enter a,b,c");

scanf("%d%d%d",&a,&b,&c);

c=a+b;

printf("%d",sum is &c);

}

Answer 3

#include <iostream>

using namespace std;

int main()

{

int x, y;

char func;

cout << "Enter number: ";

cin >> x;

cout << "Enter function: (+, -, *, /)";

cin >> func;

cout << "Enter another number: ";

cin >> y;

switch(func)

{

case '+':

cout << x + y << endl;

break;

case '-':

cout << x - y << endl;

break;

case '*':

cout << x * y << endl;

break;

case '/':

cout << x / y << endl;

break;

default:

cout << "Invalid function" << endl;

break;

}

char wait;

cin >> wait;

return 0;

}

Answer 4

#include<stdio.h>

#include<conio.h>

#include<process.h>

#include<dos.h>

#include<stdlib.h>

#include<iostream.h>

#include<graphics.h>

#include<math.h>

#include<string.h>

float *mem;

int X=0, Y=0;

int row=17,col=5;

char dummy;

char flag='d',flagp='0';

char bflag='u',bflagp='u';

int mflag=0;

char ch,ch1,ch2;

int sflag=0;

int midx,midy;

# define UNCLICKED 0

# define CLICKED 1

# define PI 3.14159

char str1[]={" Saikat Sengupta "};

void typeit (int x,int y,int spacing,char string[])

{

char temp[2];

for (int i=0;i<strlen(string);i++)

{

delay(100);

temp[0]=string[i];

temp[1]='\0';

outtextxy(x+(i+1)*spacing,y,temp);

}//endfor

}

void front()

{

int x,y,h;

for(x=0;x<=100;x++)

{

settextjustify(CENTER_TEXT,CENTER_TEXT);

setcolor(1);

settextstyle(1,0,4);

setusercharsize(x,6,x,3);

setcolor(14);

moveto(310,135);

outtext("..");

setcolor(6);

moveto(310,130);

outtext("I I");

if(x<50)

delay(30);

else

delay(20);

}

for(y=0;y<=100;y++)

{

setcolor(0);

settextstyle(1,0,4);

setusercharsize(y,6,y,3);

moveto(310,135);

outtext("..");

moveto(310,130);

outtext("I I");

if(y>20)

{

settextstyle(7,0,3);

setusercharsize(y-20,35,y-20,30);

setcolor(9);

outtext("CALCULATER");

setcolor(2);

outtext("___________");

delay(15);

if(y<100)

{

settextstyle(7,0,3);

setusercharsize(y-20,35,y-20,30);

setcolor(0);

outtext("CALCULATER");

}

}

}

//delay(1000);

settextstyle(3,0,2);

delay(50);

outtextxy(midx-200,midy," Project Assistant of NIELIT :-");

//x=10,y=10;

setcolor(6);

settextstyle(4,0,4);

typeit(midx-200,midy+50,15,str1);

getch();

//exit(1);

//closegraph();

}

char input();

double add(double,double,char);

double angle_conv(double);

void basecng(double,double);

/************************************************************/

/* */

/* THIS FUNCTION DRAWS THE BUTTONS OF THE CALCULATER */

/* */

/************************************************************/

void button_3d(int x1,int y1,int x2,int y2,int check,char* text,int color)

{

int up,low;

setfillstyle(1,7);

bar(x1,y1,x2,y2);

if(check==0) //Unclicked

up=15,low=8;

else

up=8,low=15; //Clicked

setcolor(low);

line(x2,y1,x2,y2);

line(x2-1,y1,x2-1,y2);

line(x1,y2,x2,y2);

line(x1+1,y2-1,x2,y2-1);

setcolor(up);

line(x1,y1,x2,y1);

line(x1+1,y1+1,x2-1,y1+1);

line(x1,y1,x1,y2);

line(x1+1,y1+1,x1+1,y2-1);

setcolor(color);

settextjustify(CENTER_TEXT,CENTER_TEXT);

outtextxy(x1+(x2 - x1)/2,(y1+(y2 - y1)/2)-2, text);

}

/*********************************************************************/

/* */

/* This function makes the opening screen */

/* */

/*********************************************************************/

void frontpage(void)

{

int mx, my;

mx = (getmaxx() / 2);

my = (getmaxy() / 2);

//SET baqckground color

setfillstyle(9, 1);

bar(0,0,getmaxx(),getmaxy());

//DRAW a bar, and make it look like a 3d bar

setfillstyle(1,7);

bar(50,20,600,400);

//DRAW lines for the top and left side

setcolor(03);

line(50,20,600,20);

line(51,21,599,21);

line(50,20,50,400);

line(51,21,51,399);

//DRAW lines for the bottom and right side

setcolor(11);

line(600,20,600,400);

line(599,21,599,400);

line(50,400,600,400);

line(51,399,600,399);

//DRAW two 3D bars for the left and right side

setfillstyle(9,8);

bar(70,40,100,380);

//getch();

bar(545,40,575,380);

setcolor(8);

rectangle(70,40,100,380);

rectangle(545,40,575,380);

setcolor(15);

line(100,40,100,380);

line(70,380,100,380);

line(575,40,575,380);

line(545,380,575,380);

//DRAW two 3D divider lines on both sides

setcolor(8);

line(110, 40, 110, 380);

line(535, 40, 535, 380);

setcolor(15);

line(111, 40, 111, 380);

line(536, 40, 536, 380);

//PRINT 3D text CALENDAR 2002

settextstyle(1, 0, 4);

settextjustify(1,1);

setcolor(15);

outtextxy(mx+2, my - 46, "MY CALCULATER");

setcolor(7);

outtextxy(mx + 1, my - 45, "MY CALCULATER");

setcolor(8);

outtextxy(mx + 2, my - 44, "MY CALCULATER");

//PRINT 3D text 2002

setcolor(15);

outtextxy(mx, my + 10, "2012");

setcolor(7);

outtextxy(mx + 1, my + 11, "2012");

setcolor(8);

outtextxy(mx + 2, my + 12, "2012");

//PRINT copyright notice

settextstyle(2, 0, 5);

setcolor(1);

outtextxy(mx + 1, my + 85, "Copyright 2012 by DOEACC");

getch(); //PAUSE for a while

}

/*********************************************************************/

/* */

/* This function makes the claculating screen */

/* */

/*********************************************************************/

void screen(int x1, int y1, int x2, int y2)

{

setlinestyle(0,0,1);

setfillstyle(SOLID_FILL, 8);

bar(x1, y1, x2, y2);

setfillstyle(SOLID_FILL, BLACK);

bar(x1+1, y1+1, x2-1, y2-1);

settextjustify(CENTER_TEXT, CENTER_TEXT);

setcolor(15);

line(x1+1, y1+1, x1+1, y2-1);

line(x1+1, y1+1, x2-1, y1+1);

line(x1+2, y1+2, x1+2, y2-2);

line(x1+2, y1+2, x2-2, y1+2);

setcolor(8);

line(x1+1, y2-1, x2-1, y2-1);

line(x2-1, y1+1, x2-1, y2-1);

line(x1+2, y2-2, x2-2, y2-2);

line(x2-2, y1+2, x2-2, y2-2);

}

/************************************************************************/

/* */

/* Mouse Related Functions */

/* */

/************************************************************************/

void init_mouse()

{

union REGS iregs, oregs;

iregs.x.ax = 0;

int86 (0x33, &iregs, &oregs);

if (oregs.x.ax 0);

ch=getch();

return ch;

}

/*************************************************************************/

/* */

/* This function performs the Calculations */

/* */

/*************************************************************************/

double add(double x,double y,char ch)

{

switch(ch)

{

case '+':

y=x+y;

break;

case '-':

y=x-y;

break;

case '*':

y=x*y;

break;

case '/':

y=x/y;

}

return y;

}

double angle_conv(double no)

{

if(flagp=='d')

{

if(flag=='r')

{

no=no*PI/180;

}

if(flag=='g')

{

no=no*1.1111111;

}

}

else if(flagp=='r')

{

if(flag=='d')

{

no=no*180/PI;

}

if(flag=='g')

{

no=no*180/PI*1.1111111;

}

}

else if(flagp=='g')

{

if(flag=='r')

{

no=no/(180*1.1111111)*PI;

}

if(flag=='d')

{

no=no/1.1111111;

}

}

return(no);

}

void basecng(double y,double pnt1)

{

char str[17];

switch(bflag)

{

case 'v':

itoa(y,str,8);

gotoxy(row,col);

printf("\t\t\t\t ");

gotoxy(row,col);

printf("%s",str);

bflagp='0';

break;

case 'w':

itoa(y,str,16);

gotoxy(row,col);

printf("\t\t\t\t ");

gotoxy(row,col);

printf("%s",str);

bflagp='0';

// getch();

break;

case 'x':

itoa(y,str,2);

gotoxy(row,col);

printf("\t\t\t\t ");

gotoxy(row,col);

printf("%s",str);

// getch();

bflagp='0';

break;

}

bflag='u';

}

Answer 5

double area(double width, double length)

{

return (width * length);

}

Answer 6

Not possible.