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  1. #1
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    Mar 2013
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    Compound if statements

    Good day,

    This is where I start, below is a practice and my solution for a problem statement that I have to right an algorithm for.

    Is my solution correct?
    Will my if statement compare the 3 values and come up with the best by?
    Please enlighten me...

    Problem Statement
    Rebecca needs to buy a bag of Milie meal. She wrote down the prices of 500 g, 750 g and 1 kg of Milie meal. Determine which one of the packets is the best buy. Do the calculations and display which packet she should buy. The user should be prompted to enter the prices for all three packets.

    My answer is as follows

    variables used:
    price500g real
    price750g real
    price1kg real
    bestBuy string

    if price500g * 2 < price1kg AND price750g + 250 then
    bestBuy = 500g
    else
    price750g + price750g / 3 < price500g * 2 and price1kg then
    bestBuy = 750g
    else
    price1kg < price500g * 2 AND price750g + price750g / 3
    bestBuy = 1kg
    endif
    endif
    endif
    ~Display results
    display "The Milie meal to buy is", bestbuy
    end

  • #2
    Regular Coder
    Join Date
    Mar 2012
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    Well let's take a look...

    Code:
    if price500g * 2 < price1kg AND price750g + 250
    Change the bold to price750g*(4/3) . This would give us the price for 1000g (equivalent).

    Code:
    price750g + price750g / 3 < price500g * 2 and price1kg then
    We found the price of 500g in the first part, so you don't need to multiply price500g*2, instead we need to divide price1kg by two.

    Code:
    price1kg < price500g * 2 AND price750g + price750g / 3
    The first part looks good but for the second part we need to multiply price750g by four and divide that by 3.

    For example...
    Code:
    price500g
    price750g
    price1kg
    
    if(price500g < (price750g*2/3) && price500g < price1kg/2)
    bestBuy = price500g;
    else if()
    .
    .
    .
    else if()
    .
    .
    .
    Of course the programming language would determine exactly how that looks.

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