CSCI 240 - Possible Questions for Quiz 2

  1. (2 points) What instruction will display data on the screen from a C++ program?

    1. int
    2. cin
    3. cout
    4. display

  2. (2 points) About how many decimal places of accuracy does a float have?

    1. 31
    2. 12
    3. 6
    4. 4

  3. (2 points) The formula for converting a Fahrenheit temperature to Centigrade is 5/9(F - 32). What is wrong with writing it in C++ as

    4. C = 5/9 * (F - 32);

    assuming that C and F are both declared as doubles, and F has a valid value.

  4. (2 points) What is the value of the expression 25 % 3?

    1. 8
    2. 1
    3. 0
    4. undefined

  5. (2 points) Explain in detail what the following instruction does (assuming i is declared as int):

    6. cin >> i;

  6. (2 points) Suppose you have two integer variables (named num and sum) with valid values. Write a single cout instruction to display them as follows:

    7. num is __
    sum is __

    the underscore characters will show the actual values in num and sum - for example:

    num is 4
    sum is 24

  7. (2 points) Name two libraries that should be #include'd at the top of a C++ program.

  8. (2 points) Assuming that two floating point numbers have been saved in the variables num1 and num2, write a chunk of program code that will display the integer result of the sum of num1 and num2. For example, if num1 contains 2.4 and num2 contains 2.5, then the value 4 should be displayed.

  9. (2 points) Write a chunk of program code that asks the user to enter two floating point numbers and saves the values in two float variables called val1 and val2.