CS Spring 2007 Homework #7

Transcription

1 CS Spring 2007 Homework #7 Quiz to be held in class 9:30-9:45am Mon March DESCRIBE THE CONDITION of an if block. ( The condition is a... ) 2. For each of these kinds of statements, mark CAN if it can appear inside a clause of an if block, and mark CANNOT if it cannot appear inside a clause of an if block. EXPLAIN each. (a) A named constant declaration (b) A variable declaration (c) A printf statement (d) A scanf statement (e) An assignment statement (f) A exit statement (g) An if block 3. Debug the following program. If you aren t confident of your answer, type in, compile and run the C program to test it. #include <stdio.h> if (input_value1 < input_value2) (input_value1 > input_value2) { } /* if (input_value1 < input_value2)... */ 1

2 4. For each of the following programs, WHAT IS THE OUTPUT for each of the given sets of input? Your answer does not need to include the message that prompts the user to input the data, nor the user s input. If you aren t confident of your answer, type in, compile and run the C program to test it. (a) #include <stdio.h> if (input_value1 < input_value2) { } /* if (input_value1 < input_value2) */ i. 1 2 ii. 2 1 iii. 2 2 iv. DRAW the flowchart (on a separate page if necessary). 2

3 (b) #include <stdio.h> if (input_value1 < input_value2) { } /* if (input_value1 < input_value2) */ else { printf("second\n"); aggregate = input_value1 - input_value2; } /* if (input_value1 < input_value2)...else */ i ii iii iv. DRAW the flowchart (on a separate page if necessary). 3

4 (c) #include <stdio.h> if (input_value1 < input_value2) { } /* if (input_value1 < input_value2) */ else if (input_value1 > input_value2) { printf("second\n"); aggregate = input_value1 - input_value2; } /* if (input_value1 > input_value2) */ i ii iii iv. DRAW the flowchart (on a separate page if necessary). 4

5 (d) #include <stdio.h> if (input_value1 < input_value2) { } /* if (input_value1 < input_value2) */ else if (input_value1 > input_value2) { printf("second\n"); aggregate = input_value1 - input_value2; } /* if (input_value1 > input_value2) */ else { printf("neither\n"); aggregate = input_value1 * input_value2; } /* if (input_value1 > input_value2)...else */ i ii iii iv. DRAW the flowchart (on a separate page if necessary). 5

6 5. WRITE A C PROGRAM that inputs a floating point value, calculates its absolute value, and outputs the absolute value. You MUST use if properly to complete this program. You are ABSOLUTELY FORBIDDEN to use the C standard library functions abs or fabs. You do not need to have comments; otherwise, all programming project rules apply. Also, DRAW THE FLOWCHART. 6

7 6. When you write an if-block for idiotproofing, does the exit statement belong BEFORE the if-block, INSIDE the if-block or AFTER the if-block? Therefore, should the exit statement be indented LESS THAN the if statement, THE SAME AS the if statement, or MORE THAN the if statement? 7

8 7. The Kelvin temperature scale is very similar to the Celsius temperature scale, except that zero degrees Kelvin is absolute zero, the lowest physically conceivable temperature. Zero degrees Kelvin is degrees Celsius. 1 WRITE A PROGRAM that greets the user, then prompts for and inputs a temperature in degrees Kelvin, then IDIOTPROOFS, then calculates the associated temperature in degrees Celsius, then outputs the temperature in degrees Celsius. You do not have to use comments. Otherwise, all rules for Programming Projects (through PP#4) apply. If you use ANY resources other than Dr. Neeman, Mr. Diaz-Gomez, Mr. Mohanoor Canthadai, the course textbook or the materials posted on the course webpage, you MUST reference them on the quiz. THIS INCLUDES YOUR CLASSMATES, FRIENDS, PROFESSORS, ETC