Beginning C

Beginning C++ is a tutorial for beginners in C++ and discusses a subset of C++ that is suitable for beginners. The language syntax corresponds to the C++14 standard. The language syntax corresponds to the C++14 standard. List: Last names beginning with C in the United States.

PROBLEM We are writing a program that will aid an elementary school student learns multiplication. Use random function to generate positive one digit integers and it should display questions of multiplication such as: How much is 5 x 8? The student then input the answer. The program should check the answer and response with correct or wrong message. Then another multiplication question is displayed. The process should be repeated until -1 is inputted by the student meaning to exit the program. Finally the program displays the number of correct answer and questions asked.

The program also should have three level of difficulties of question. The first level is multiplication of two integers. As the level goes up, the multiplication question consists of three integers and four integers for the highest level. The program should be able to adjust the level difficulty automatically according to the performance of the student. For example it should increase the level if the student able to answer correctly for five consecutive questions and vice-versa. SOLUTION PROGRAM ALGORITHM (FLOW OF PROGRAM) 1.

Display user instructions 2. Display a multiplication question and compute the answer 3. Get data: user answer 4. Check the user answer with the computed answer 5.


Determine the level of difficulty 6. Display the performance of the user Steps 2-5 are repeated until the user exit the program.

PROGRAM DESIGN We use functions to perform all required task in the program. There are six (6) functions have been defined accordingly, display the user instructions, generate integers, print the question, read user answer and check it with the correct answer, adjust the level of difficulty and display user performance. Design of Function PrintUserInstructions Input Parameter None Program Variable None Return Value None The definition consists of three statements to display user instructions. Design of Function GenerateNumber Input Parameter None Program Variable None Return Value rand% 9 + 1 The expression rand% 9 + 1 always returns a value in the range 1 ≤ integer ≤ 9. Function rand returns a pseudo-random number each time it is invoked. Pseudo-random number is a sequence of numbers that appears to be random that is generated using an initial value (seed). For a given seed, the sequence is always the same.

If we use function rand with the default seed, we will always get the same sequence. Therefore, in order to obtain a random number, we have to randomize the seed. In C, there is a function called srand that can be used to initialize the pseudo-random generator by supplying a seed value as an argument to it. Now what we have to do is to supply a different value each time the program is run. This can be achieved by using function time which returns the number of seconds that have passed since 00:00:00 GMT January 1, 1970.

Design of Function PrintQuestion Input Parameter int level /. level of difficulty./ Program Variables int i /. loop counter./ int num /.store generated integer./ int ans /. store the computed answer./ Return Value int ans /. store the computed answer./ Function PrintQuestion uses for loop statement to print the multiplication question. In each iteration, an integer is generated by calling function GenerateNumber and multiplied with variable ans. The loop condition uses level (function's argument) in the loop condition.

Initially, level has the value of 1 (level 1), therefore the loop is repeated twice which means the multiplication question will be consisted of two numbers. Design of Function InputAnswer Input Parameter int correctans /. store the correct answer./ Program Variable int userans /. store the user answer./ Global Variables int cntquestion /. count the total questions have been asked./ int cnttrue /.

count total true answer./ int cntconsecutivetrue /. count consecutive true answer./ int cntconsecutivefalse /. count consecutive false answer./ Return Value QUIT 0 CONT 1 User answer is read by using scanf and stored in variable userans. Then userans is tested.

If the value is -1, symbolic constant QUIT is returned. Ssr movies hollywood hindi dubbed. Else variable cntquestion is incremented and userans is tested. If userans is equal to correctans, variables cnttrue and cntconsecutivetrue are incremented and zero is assigned to cntconsecutivefalse.

Design of Function AdjustDifficulty Input Parameter int level Program Variable None Return Value int level Difficulty level is adjusted based on the value of variables cntconsecutivetrue and cntconsecutivefalse. Design of Function PrintResult Input Parameter None Program Variable None Return Value None The definition consists of two statements to display the total number of correct answers and total number of questions asked. IMPLEMENTATION Begin by writing the #define directives for the constant data and global variables. In the main, declare the variables for correct answer, level of difficulty and loop control variable.

Then start coding each program algorithm steps. Call function PrintUserInstructions to display the user instruction/prompt. Then call the functions PrintQuestion, InputAnswer and AdjustDifficulty.

These functions should be placed in the body of the program loop since they will be repeated until the user wants to exit. Finally call the function PrintResult to display the result. Don't forget to use comments in your program so as you won't get lost. Good luck and Happy Coding!