Illustrative Solution for Lab #2
~ problem #2 on page 33 in the Robertson text ~
with parameter passing
PROBLEM STATEMENT
You require an algorithm that will receive two integer items from a terminal operator [i.e., user],
and display to the screen their sum, difference, product and quotient.
DEFINING DIAGRAM
Input
integer1
integer2
STRUCTURE CHART
Processing
 Get two numbers from user.
 Calculate their sum, difference,
product and quotient.
 Display results.
Output
sum, difference,
product, and
quotient of
numbers entered
by user
ALGORITHM EXPRESSED IN PSEUDOCODE:
Basic_calculator (mainline)
Get_numbers(integer1, integer2)
Perform_operations(integer1, integer2, sum, difference, product, quotient)
Report_results(sum, difference, product, quotient)
END
Get_numbers(integer1, integer2)
Prompt for two integer values
Get integer1 and integer2 from user
END
Perform_operations(integer1, integer2, sum, difference, product, quotient)
Add(integer1, integer2, sum)
Subtract(integer1, integer2, difference)
Multiply(integer1, integer2, product)
Divide(integer1, integer2, quotient)
END
Report_results(sum, difference, product, quotient)
Display ‘the sum of the numbers is: ‘, sum
Display ‘the difference of the numbers is: ‘, difference
Display ‘the product of the numbers is: ‘, product
Display ‘the quotient of the numbers is: ‘, quotient
END
ALGORITHM EXPRESSED IN PSEUDOCODE: (continued)
Add(integer1, integer2, sum)
sum = integer1 + integer2
END
Subtract(integer1, integer2, difference)
difference = integer1 - integer2
END
Multiply(integer1, integer2, product)
product = integer1 × integer2
END
Divide(integer1, integer2, quotient)
quotient = integer1 ÷ integer2
END