Ceng198

Introduction to Computer Programming

Lab#3

Part I. Introduction to “while” Repetition Statement

Compile and run the following program. Analyze the output.

Part II. Nested Control Structures

Modify the code above so that

• it only calculates the grades between 0 and 100.

• If the user enters a grade below 0 (except “-1”), or above 100, the program should warn user with a message such as “Illegal grade entered!”.

• The program should ask grades from user ‘till the user enters -1.

Part III. Do It Yourself

Write a program that

• takes three grades (first midterm, second midterm, final) from user,

• and then calculates the total grade of the student according to the following formulation:

Total Grade = First Midterm * 0.25 + Second Midterm * 0.25 + Final * 0.5

• after calculating the total grade of the student, convert it to the letter form using following table,

• print the letter equivalent of the students grade to the screen.

• Use nested-if structure

Grade (0-100)	Letter Equivalent
90-100	AA
85-89	BA
75-84	BB
70-74	CB
60-69	CC
55-59	DC
45-54	DD
25-44	FD
0-24	FF

Part IV. Do It Yourself

Modify the previous program as;

• Numer of students is 10

• Report as

Student 1 got 50 --> DD

.

.

.

Class average is .....

Part V. Do It Yourself

Write a complete C program to do following tasks:

• Given that product=2

• Find the number of repetitions when the test condition is product <=1000. (you will need to use a while loop control structure)