3.8: Case Study- Practice Multiplication

Example

We will be using a random function and a nested if-else statement (an if-else statement inside of an if-else statement). Let's begin.

The first part of this program is codded as following:

Line 7: declares three integer variables

Line 8 - Line 9: use random function to generate two random numbers between 1 and 100 and assign them into variable a and b

Line 10 - Line 15: display the question. Use setw() to correctly align the question and the box

Now, we add the rest of the code of this program as following:

Line 16: a cin statement to take the user input and assign to the variable product

Line 17 - Line 37: It is an if-else statement which checks the user input of the first question

Line 18 - Line 32 (the code inside of red box): This is the body of if, which are code the program will be executing when the value of the relational statement "product==a*b" is true, which means the answer user entered is correct). This block of code provides the feedback (Line 18) and produce another question (Line 19 - Line 26). Inside of this block of the code, we use another if-else statement (Line 28 - Line 33) to check the answer of the second question and provide the feedback. Line 29 will be executed if the user enter the correct answer for the second question and Line 32 will be executed if the answer to the second question is wrong.

Line 36: This is the body of the else of the first if-else statement, which gives the user feed back and provide the correct answer of the first question. Line 36 will only be executed when the relational statement in Line 17 (which means the user did not get the correct answer of the first question)

In this program, we are using an if-else statement inside of the another if-else statement. In an if-else statement, if the body of if or the body of else also contains an if-else statement, we call such statement a nested if-else statement.

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