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Home » Placement Papers » De Shaw Placement Papers » De Shaw Placement Paper

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De Shaw Placement Paper



Write the programs for the following problems in C.

1. Swap two variables x,y without using a temporary variable.

2. Write algorithm for finding the GCD of a number.

3.Write a program for reversing the given string.

4. The integers from 1 to n are stored in an array in a random
    fashion. but one integer is missing. Write a program to find the
    missing integer.

Ans): Hint : The sum of n natural numbers is = n(n+1)/2.
         if we subtract the above sum from the sum of all the
         numbers in the array , the result is nothing but the
         missing number.

5. Some bit type of questions has been given on pointers asking to
    to find whether it is correct from syntax point of view. and if
    it is correct explain what it will do. (around 15 bits).


6. For the following C program

#define AND &&
#define ARRANGE (a>25 AND a<50)
{int a = 30;
printf("within range");
printf("out of range");

What is the output?

7. For the following C program

#define AREA(x)(3.14*x*x)
{float r1=6.25,r2=2.5,a;
printf("\n Area of the circle is %f", a);
printf("\n Area of the circle is %f", a);

What is the output?

Ans. Area of the circle is 122.656250
Area of the circle is  19.625000

8. What do the following statements indicate. Explain.

  • int(*p)[10]

  • int*f()

  • int(*pf)()

  • int*p[10]

Refer to:
-- Kernighan & Ritchie page no. 122
-- Schaum series page no. 323

9. Write a C program to find whether a stack is progressing in forward
    or reverse direction.

10. Write a C program that reverses the linked list.


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