C++ Arithmetic Operations

Write a program that lets the user perform arithmetic operations on two numbers. Your program must be menu driven, allowing the use to select the operation (+, -, *, or /) and input the numbers. 

Furthermore, your program must consist of following functions:

• Function show Choice: This function shows the options to the user and explains how to enter data.
•  Function add: This function accepts two number as arguments and returns sum.
• Function subtract: This function accepts two number as arguments and returns their difference.
• Function multiply: This function accepts two number as arguments and returns product.
•  Function divide: This function accepts two number as arguments and returns quotient

Program

#include <iostream>
#include <conio.h>
#include<string.h>
using namespace std;
char showmanue()
{
char operand;
cout<<"(a) choice for sum";
cout<<"\n(b) choice for sub";
cout<<"\n(c) choice for mul";
cout<<"\n(d) choice div";
cout<<"enter the operand";
cin>>operand;
return operand;
}
int sum(int a,int b)
{
int sum;
cout<<"enter the a";
cin>>a;
cout<<"enter the b";
cin>>b;
sum= a+b;
cout<<sum;
}
int sub(int a,int b)
{
int sub;
cout<<"enter the a";
cin>>a;
cout<<"enter the b";
cin>>b;
sub= a-b;
cout<<sub;
}
int mul(int a,int b)
{
int mul;
cout<<"enter the a";
cin>>a;
cout<<"enter the b";
cin>>b;
mul= a*b;
cout<<mul;
}
int div(int a,int b)
{
int div;
cout<<"enter the a";
cin>>a;
cout<<"enter the b";
cin>>b;
div= a/b;
cout<<div;
}
int main()
{
char ret;
ret=showmanue();
if (ret=='+')
{
int a,b;
sum(a,b);
}
else if (ret=='-')
{
int a,b;
sub(a,b);
}
else if (ret=='*')
{
int a,b;
mul(a,b);
}
else if (ret=='/')
{
int a,b;
div(a,b);
}
}