UMBC CMSC201, Computer Science I, Spring 1994 Sections 0101, 0102 and Honors

Quiz 1

True or False Questions, 1 point each

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  1. All variables must be declared before they are used.

    Your answer:

  2. The expression ++x has a side effect.

    Your answer:

  3. The expressions a + b % c and (a + b) % c are equivalent

    Your answer:

  4. The expressions a - b - c and a - (b - c) are equivalent.

    Your answer:

  5. The expressions 15 / 3 and 15 / 3.0 are equivalent.

    Your answer:

  6. The following declaration is used to declare a variable with Boolean type. 
    	bool flag ;

    Your answer:

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Multiple Choice, 2 points each

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  1. Which of the following is a legal variable name in C:
    a. FiftyFifty
    b. 50_50
    c. Fifty-Fifty
    d. Fifty/fifty

    Your answer:

  2. In C, the term ``white space'' means:
    a. A single space, tab or new-line character.
    b. Several spaces, tabs or new-line characters.
    c. Any combination of spaces, tabs and new-line characters.
    d. All of the above.

    Your answer:

  3. What is the value of the integer expression: 1 - 3 * 5 + 6 / 4 % 2
    a. 0
    b. -6
    c. -8
    d. -13

    Your answer:

  4. By the rules of short-circuit evaluation, in the following expression, 
         p || ( n < 3 )

    a. if p is true, then n < 3 will not be evaluated.
    b. if p is false, then n < 3 will not be evaluated.
    c. if p is true, then n < 3 will be evaluated.
    d. None of the above.

    Your answer:

  5. If p and q are Boolean variables, which expression is equivalent to the following expression? 
         !( p || q)

    a. !p || !q
    b. p || q
    c. !p && !q
    d. p && q

    Your answer:

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Short Answers, 4 points each

This section cannot be graded on-line. To practice taking the exam, jot down your answer and click on the button after each question to see a sample solution.

There are no syntax errors in this section.

  1. Write down (line by line) the output of the following program fragment. 
          int a = 1, b = 2 ;
      
      printf("a = %d, b = %d\n", a, b) ;
      a += b ;
      printf("a = %d, b = %d\n", a, b) ;
      a = b++ ;
      printf("a = %d, b = %d\n", a, b) ;
    Click here for a sample answer.

  2. What is the output of the following code? 
          int a, b ;

      a =  6 ;
      b =  9 ;
      if ( a * b == 42 ) {
         printf("Hitchhiker's Guide\n") ;  
      } else if ( a - b < -3  ) {
         printf("Milliway's\n") ;
      } else {
         printf("Life, the Universe and Everything\n") ;
      }
    Click here for a sample answer.

  3. What is the output of the following code? 
          int n, i ;
     
      i = 0 ;
      n = 2048 ;
      while (n > 0) {
         n = n / 2 ;
         printf("n = %d\n", n) ;
         i++ ;
      }
      printf ("i = %d,  n = %d\n", i, n) ;
    Click here for a sample answer.
Last Modified: Mon Sep 4 15:33:59 EDT 1995

Richard Chang, chang@gl.umbc.edu