Question

3) How to write a code for a 'menu' in c++? write all of the possible ways with steps

Answer 1

I have given an example of step by step process to write menu program for a calculator .

Step 1:

First declare all the variable to be used in the program.

Step 2:

Then display all the the choice to the user for example:

cout<<"Press 1 to add";

cout<<"Press 2 to subtract";

cout<<"Press 3 to multiply"

Step 3:

The user will input their choice

cin>>choice

Step 4:

Then the switch case statement will be written:

switch(case) // the input of the user will trigger switch case and the case will be triggered according to users choice

{ and one can take any number or alphabet as input from user in order to trigger a particular case

case 1: in this example I have given case 1 one can also write case A or case a to trigger case accordingly

cout<<"Enter numbers"

cin>>a

cin>>b

sum=a+b;

cout<<sum;

break; // After every case break statemnt will break away from the switch case statement

case 2:

cout<<"Enter numbers"

cin>>a

cin>>b

sub=a-b;

cout<<sub;

break;

case 3:

cout<<"Enter numbers"

cin>>a

cin>>b

mul=a*b;

cout<<mul;

break;

default: // if the user input anything which is not in the case then this message will be printed

cout<<"Wrong input";

}

Step 5:

The program will end