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Technical - C & C++ by Alumnus

Details of Technical - C & C++ by Alumnus conducted by Alumnus for job interview.
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Each question had 5 options.There were 25 question in all and all  were Objective Type. 

1     When compiled from command line what are linking options?
2     You have written a code in C++, and u have to use a C library ,  what would u do?
       (Ans: write extern  "c" in header files)
3     Fiber optic backbone is in which OSI layer?

4     void main()
            int x=1;
            int y=1;
            int i;
      What are the values of x & y?

 5    If we carry out operation (-3)+(-6),then which of the what will be  the value of carry and sign flag?
 6    void abc(int a[])
           int k=0;int j=50;
        How many times the loop will occur?

 7     Integrate e^(x^-2)dx , with limits -infinity to +infinity?What is  the final value?
 8     Let p be a 16 bit number.The 2,s complement of p will be  represented by?
 9     void main()
           int a[]={5,4,3,2,1};
           int x,y;
           int *p=&a[2];
           printf("%d %d",x,y),
         What will be the value of x and y?

10     Let there be a set of 3 numbers.Then number of groups possible?
11     A question on some technique used in DA-converter?
12     Which data structure to use for fastest search?
13     A binary tree contains 1024 elements.What is maximum number of  comparisons needed to search an    

14     s=1-1/4+1/16-1/32...... What is the value of S?(Ans = 0.8 Hint Its a GP)
15     A C++ class has multiple references to base class.Then some  options were given?

16     for(i=0;i<20;i++)

        What is final value of array a? Options were there.
17    In Java can a variable be initilised inside a loop?
18    Two dices are thrown.What is the probality that the the number on  the first dice is greater or equal to
        number on the second dice?