Test 3 CSCI 130 Fall 2013

Please answer each question fully, carefully and thoughtfully.
No credit will be given for unreadable answers, please write neatly.
Answer the questions in any order, but please number each answer.
Make sure that your name is on your test.

Boolean Type
1. [2 points] Describe the boolean type.
2. [3 points] Describe the operations unique to the boolean type.
If statements
1. [1 point] Give the syntax for the if statement. Not if else.
2. [2 points] Give the flow of control for the if statement. State this in English, not as a diagram.
3. [2 points] Give an example of an if statement.
While statements
1. [1 point] Give the syntax for the while statement.
2. [2 points] Give the flow of control for a while statement.
3. [2 points] Give the preferred use for the while statement.
Loops
1. [3 points] State the three general rules fro constructing a successful loop.
2. [3 points] Give an example loop, label each of the three points mentioned above in your example. (as comments)
3. [2 points] Give the syntax for the C/C++ for control structure.
4. [2 points] How does the C/C++ for syntax assist programmers when creating a loop?
Strings
1. [2 points] Describe the syntax of the string length member function.
2. [2 points] Describe the operation of the string find member function.
3. [2 point] What is string::npos?
4. [2 point] How does a programmer access an individual character within a string?
[7 points] Write a code segment which will print the string stored in the string variable phrase out in revers order. If phrase = "hello world!", your should print !dlrow olleh.
[10 points] Write a program which empirically proves Gauss's method for summing the first n integers. Gauss discovered that 1 + 2 + 3 + ... + n = n(n+1)/2. Your program should compute this sum, both by adding and by using the formula for the n between 1 and 20. You should provide a statement which checks the results and prints Good if they are both the same and Wrong if they are not. Your output should be of the form
```
N       Sum      Formula     Check
----------------------------------
1        1          1         Good
2        3          3         Good
....
20       210        210       Good
     
```