Sample Questions Best site for GRE, LSAT, SAT, GMAT, TOEFL, CCNA, CCSA and interview sample questions  

Technical Sample Questions : C |  C++ |  Oracle |  Java | Unix |  Operating Systems |  Data Structure

Sample Technical Questions

C Sample Question

  1. What is the output of the program given below
    main()
        {
           signed char i=0;
           for(;i>=0;i++) ;
           printf("%d\n",i);
        }

    Answer:

    -128

    Explanation: Notice the semicolon at the end of the for loop. THe initial value of the i is set to 0. The inner loop executes to increment the value from 0 to 127 (the positive range of char) and then it rotates to the negative value of -128. The condition in the for loop fails and so comes out of the for loop. It prints the current value of i that is -128.

  2. main()
        {
           unsigned char i=0;
           for(;i>=0;i++) ;
           printf("%d\n",i);
        }

    Answer:

    infinite loop

    Explanation:

    The difference between the previous question and this one is that the char is declared to be unsigned. So the i++ can never yield negative value and i>=0 never becomes false so that it can come out of the for loop.
  3. main()
        	{
           char i=0;
           for(;i>=0;i++) ;
           printf("%d\n",i);
            
     }

    Answer:

    Behavior is implementation dependent.

    Explanation:

    The detail if the char is signed/unsigned by default is implementation dependent. If the implementation treats the char to be signed by default the program will print –128 and terminate. On the other hand if it considers char to be unsigned by default, it goes to infinite loop.

    Rule:

    You can write programs that have implementation dependent behavior. But dont write programs that depend on such behavior.
  4. Is the following statement a declaration/definition. Find what does it mean?
    int (*x)[10];

    Answer:

    Definition.
    x is a pointer to array of(size 10) integers.
    Apply clock-wise rule to find the meaning of this definition.
  5. What is the output for the program given below
    typedef enum errorType{warning, error, exception,}error;
         main()
        {
            error g1;
            g1=1; 
            printf("%d",g1);
         }

    Answer:

    Compiler error: Multiple declaration for error

    Explanation:

    The name error is used in the two meanings. One means that it is a enumerator constant with value 1. The another use is that it is a type name (due to typedef) for enum errorType. Given a situation the compiler cannot distinguish the meaning of error to know in what sense the error is used:
    error g1;
    g1=error;
    // which error it refers in each case? When the compiler can distinguish between usages then it will not issue error (in pure technical terms, names can only be overloaded in different namespaces).

    Note:

    the extra comma in the declaration,
    enum errorType{warning, error, exception,}
    is not an error. An extra comma is valid and is provided just for programmer's convenience.

« Previous || Next »

C Sample Question Number : 1-3 | 4-7 | 8-11 | 12-16 | 17-21 | 22-25 | 26-30 | 31-35 | 36-40 | 41-45 | 46-48 | 49-52 | 53-59 | 60-64 | 65-69 | 70-74 | 75-79 | 80-83 | 84-87 | 88-91 | 92-95 | 96-100 | 101-105 | 106-110 | 111-115 | 116-120 | 121-125 | 126-130 | 131-135 | 136-140 | 141-145 | 146-150

Sample Test Questions
GRE Sample Questions
CAT Sample Questions
GMAT Sample Questions
TOEFL Sample Questions
ACT Sample Questions
SAT Sample Questions
LSAT Sample Questions
PSAT Sample Questions
MCAT Sample Questions
PMP Sample Questions
GED Sample Questions
ECDL Sample Questions
DMV Sample Questions
CCNA Sample Questions
MCSE Sample Questions
Network+ Sample Questions
A+ Sample Questions
Technical Sample Questions
WASL Sample Questions
CISA Sample Questions

Other Sample Questions
Sample Interview Questions
Sample Teacher Interview Questions
Sample Citizenship Questions
Accuplacer Sample Questions
Science Bowl sample Questions
Driving Test Sample Questions
Sample Survey Questions Sample Essay Questions
Sample Behavioral Interview Questions

Copyright © 2004-2013, Best BSQ. All Rights Reserved.