آموزش نحوه نوشتن برنامه ماشین حساب به زبان c

#include <stdio.h>

int main()

{

// declare local variables

char opt;

int n1, n2;

float res;

printf (” Choose an operator(+, -, *, /) to perform the operation in C Calculator \n “);

scanf (“%c”, &opt); // take an operator

if (opt == ‘/’ )

{

printf (” You have selected: Division”);

}

else if (opt == ‘*’)

{

printf (” You have selected: Multiplication”);

}

else if (opt == ‘-‘)

{

printf (” You have selected: Subtraction”);

}

else if (opt == ‘+’)

{

printf (” You have selected: Addition”);

}

printf (” \n Enter the first number: “);

scanf(” %d”, &n1); // take fist number

printf (” Enter the second number: “);

scanf (” %d”, &n2); // take second number

switch(opt)

{

case ‘+’:

res = n1 + n2; // add two numbers

printf (” Addition of %d and %d is: %.2f”, n1, n2, res);

break;

case ‘-‘:

res = n1 – n2; // subtract two numbers

printf (” Subtraction of %d and %d is: %.2f”, n1, n2, res);

break;

case ‘*’:

res = n1 * n2; // multiply two numbers

printf (” Multiplication of %d and %d is: %.2f”, n1, n2, res);

break;

case ‘/’:

if (n2 == 0)   // if n2 == 0, take another number

{

printf (” \n Divisor cannot be zero. Please enter another value “);

scanf (“%d”, &n2);

}

res = n1 / n2; // divide two numbers

printf (” Division of %d and %d is: %.2f”, n1, n2, res);

break;

default:  /* use default to print default message if any condition is not satisfied */

printf (” Something is wrong!! Please check the options “);

}

return 0;

}

#include<iostream.h>

#include<stdio.h>

#include<conio.h>

#include<math.h>

#include<stdlib.h>

void add();

void sub();

void multi();

void division();

void sqr();

void srt();

void exit();

void main()

{

clrscr();

int opr;

// display different operation of the calculator

do

{

cout << “Select any operation from the C++ Calculator”

“\n1 = Addition”

“\n2 = Subtraction”

“\n3 = Multiplication”

“\n4 = Division”

“\n5 = Square”

“\n6 = Square Root”

“\n7 = Exit”

“\n \n Make a choice: “;

cin >> opr;

switch (opr)

{

case 1:

add();   // call add() function to find the Addition

break;

case 2:

sub();   // call sub() function to find the subtraction

break;

case 3:

multi(); // call multi() function to find the multiplication

break;

case 4:

division(); // call division() function to find the division

break;

case 5:

sqr(); // call sqr() function to find the square of a number

break;

case 6:

srt(); // call srt() function to find the Square Root of the given number

break;

case 7:

exit(0);   // terminate the program

break;

default:

cout <<“Something is wrong..!!”;

break;

}

cout <<” \n——————————\n”;

}while(opr != 7);

getch();

}

void add()

{

int n, sum = 0, i, number;

cout <<“How many numbers you want to add: “;

cin >> n;

cout << “Please enter the number one by one: \n”;

for (i = 1; i <= n; i++)

{

cin >> number;

sum = sum + number;

}

cout << “\n Sum of the numbers = “<< sum;

}

void sub()

{

int num1, num2, z;

cout <<” \n Enter the First number = “;

cin >> num1;

cout << “\n Enter the Second number = “;

cin >> num2;

z = num1 – num2;

cout <<“\n Subtraction of the number = ” << z;

}

void multi()

{

int num1, num2, mul;

cout <<” \n Enter the First number = “;

cin >> num1;

cout << “\n Enter the Second number = “;

cin >> num2;

mul = num1 * num2;

cout <<“\n Multiplication of two numbers = ” << mul;

}

void division()

{

int num1, num2, div = 0;

cout <<” \n Enter the First number = “;

cin >> num1;

cout << “\n Enter the Second number = “;

cin >> num2;

while ( num2 == 0)

{

cout << “\n Divisor canot be zero”

“\n Please enter the divisor once again: “;

cin >> num2;

}

div = num1 / num2;

cout <<“\n Division of two numbers = ” << div;

}

void sqr()

{

int num1;

float sq;

cout <<” \n Enter a number to find the Square: “;

cin >> num1;

sq = num1 * num1;

cout <<” \n Square of ” << num1<< ” is : “<< sq;

}

void srt()

{

float q;

int num1;

cout << “\n Enter the number to find the Square Root:”;

cin >> num1;

q = sqrt(num1);

cout <<” \n Square Root of ” << num1<< ” is : “<< q;

}