Analysis create a calculator that adds subtracts multiplies

Analysis: create a calculator that adds, subtracts, multiplies, divides and takes the modulus of a number. Use functions. Design: output a prompt - void prompt() get character answer from user (what function are they doing?) a = add, s = subtract, m = multiply, d = divide, r = remainder, q = quit double getValue() - prompt for x, prompt for y function to add - double add(double x, double y) similar functions for the other operations use a switch statement in main to choose which operation based on answer calculate solution output solution Testing: input x: 1 input y: 2 add: 3, subtract:-1, mult: 2, divide: .5, mod: 1 input x: 1 input y: 0 add: 1, sub: 1, mult: 0, divide: VALIDATE!!! cant div by zero mod: VALIDATE!! can\'t div by zero

Solution

//Tested on Ubuntu,Linux

#include <iostream>
#include <math.h>
using namespace std;
/*Variable declaration*/
double x,y;
/*add function implementation*/
double add(double x,double y) {
return (x+y);
}
/*subtract function implementation*/
double subtract(double x,double y) {
return (x-y);
}
/*multiply function implementation*/
double multiply(double x,double y) {
return (x*y);
}
/*divide function implementation*/
double divide(double x,double y) {  
return (x/y);
}
/*remind function implementation*/
double remind(double x,double y) {
return remainder(x,y);
}
/*getValue function implementation
* prompt for value of x and y*/
double getValue() {

/*Prompt for x and y value*/
std::cout<<\"Please Enter x value\"<<std::endl;
std::cin>>x;
std::cout<<\"Please Enter y value\"<<std::endl;
std::cin>>y;

return y;
}
/*Main function start*/
int main(){

char ch;

/*calling getvalue function*/
getValue();

/*Getting choice from user*/
std::cout<<\"Please Enter your choice\"<<std::endl;
std::cout<<\"a.Add\ s.Subtract\ m.Multiply\ d.Divide\ r.remainder\ q.quit\ \";
std::cin>>ch;

/*Based on the choice it will call that function*/
switch(ch){
case \'a\':         
std::cout<<\"add:\"<<add(x,y)<<std::endl;
break;
case \'s\':
std::cout<<\"subtract:\"<<subtract(x,y)<<std::endl;
break;
case \'m\':
std::cout<<\"mult:\"<<multiply(x,y)<<std::endl;
break;
case \'d\':
if(y==0) {
std::cout<<\"VALIDATE!!!cant div by zero\"<<std::endl;
}else {
std::cout<<\"divide:\"<<divide(x,y)<<std::endl;
}
break;
case \'r\':
if(y==0) {
std::cout<<\"VALIDATE!!!cant div by zero\"<<std::endl;
}else {
std::cout<<\"mod:\"<<remind(x,y)<<std::endl;
}
break;
case \'q\':
break;
}

return 0;
}
/*End main Function*/

/***************output***************/
anshu@anshu:~/Desktop/chegg$ g++ calculator.cpp -lm
anshu@anshu:~/Desktop/chegg$ ./a.out
Please Enter x value
1
Please Enter y value
2
Please Enter your choice
a.Add
s.Subtract
m.Multiply
d.Divide
r.remainder
q.quit
r
mod:1
anshu@anshu:~/Desktop/chegg$ ./a.out
Please Enter x value
1
Please Enter y value
0
Please Enter your choice
a.Add
s.Subtract
m.Multiply
d.Divide
r.remainder
q.quit
d
VALIDATE!!!cant div by zero
anshu@anshu:~/Desktop/chegg$ ./a.out
Please Enter x value
1
Please Enter y value
0
Please Enter your choice
a.Add
s.Subtract
m.Multiply
d.Divide
r.remainder
q.quit
r
VALIDATE!!!cant div by zero
anshu@anshu:~/Desktop/chegg$ ./a.out
Please Enter x value
1
Please Enter y value
2
Please Enter your choice
a.Add
s.Subtract
m.Multiply
d.Divide
r.remainder
q.quit
a
add:3
anshu@anshu:~/Desktop/chegg$ ./a.out
Please Enter x value
1
Please Enter y value
2
Please Enter your choice
a.Add
s.Subtract
m.Multiply
d.Divide
r.remainder
q.quit
s
subtract:-1
anshu@anshu:~/Desktop/chegg$ ./a.out
Please Enter x value
1
Please Enter y value
2
Please Enter your choice
a.Add
s.Subtract
m.Multiply
d.Divide
r.remainder
q.quit
m
mult:2
anshu@anshu:~/Desktop/chegg$ ./a.out
Please Enter x value
1
Please Enter y value
2
Please Enter your choice
a.Add
s.Subtract
m.Multiply
d.Divide
r.remainder
q.quit
d
divide:0.5