UMBC CMSC201, Computer Science I, Fall 1994 Section 0101, 0102 and Honors

Quiz 1

True or False Questions, 1 point each

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When a C program is compiled, the source code written in C is transformed into object code that is written in machine language.
Your answer:
A variable may begin with a letter, a digit, or an underscore '_'.
Your answer:
An expression has a side effect if it changes the value stored in a variable.
Your answer:
The expressions ++x and x++ have the same value but have different side effects.
Your answer:
The difference between variables of type double and variables of type int is that double variables can store negative numbers but int variables cannot.
Your answer:
The comments in a C program begin with /* and end with */ and are ignored by the compiler.
Your answer:

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Multiple Choice, 2 points each

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Which of the following is an integer expression.
a. the value given by a call to GetInteger().
b. the value stored in an integer variable.
c. the result of applying + to two integer expressions.
d. All of the above.
Your answer:
We say that the minus operator, -, associates left to right meaning:
a. In the expression (3 * 2) - (4 * 5), the expression on the left (3 * 2) is evaluated first.
b. In the expression 5 - 3 - 2, the - on the left is evaluated first.
c. In the expression 5 - 3 * 2, the - is evaluated first because it is on the left.
d. All of the above.
Your answer:
The expression 19/8.0
a. has type double and value 2.375.
b. has type double and value 2.
c. has type int and value 2.
d. has type int and value 2.375.
Your answer:
What numbers are printed out when the following for loop is executed? (Note that the printf statement prints out the expression i+1 and not i.)
```
   for (i = 0 ; i < 12 ; i++ ) {
      printf("%d\n", i + 1) ;
   }
```
a. The numbers 0 through 12 (including 0 and 12).
b. The numbers 1 through 12 (including 1 and 12).
c. The numbers 0 through 11 (including 0 and 11).
d. The numbers 1 through 11 (including 1 and 11).
Your answer:

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Short Answers, 4 points each

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Evaluate the following expression. Recall that *, / and % have higher precedence than + and - and all five operators associate left to right.
```
   2 + 7 + 6 * 4 - 5 / 2  + 8 % 3  
```
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Write down (line by line) the output of the following program fragment.

      int a, b ;
      
      a = 6 ; 
      b = a + 7 ;
      printf("a = %d, b = %d\n", a, b) ;
      a += b / 3  ;
      printf("a = %d, b = %d\n", a, b) ;
      a = b = 2 * a ;
      printf("a = %d, b = %d\n", a, b) ;

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What is the output of the following code?

      int a ;

      a = 27 ;
      if ( a > 27 ) {
         printf("Georges Seurat\n") ;
      } else if ( a % 3 == 0) {
         printf("Edvard Munch\n") ;
      } else {
         printf("Joan Miro\n") ;
      }

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Last Modified: Sep 3, 1995

Richard Chang, chang@gl.umbc.edu