Programming for Problem Solving - B.Tech 1st Semester Exam., 2019 (New Course)

Let x be an integer which can take a value of 0 or 1. The statement if (x == 0)x = 1; else x = 0; is equivalent to which one of the following?

1. x = 1 - x
2. x = x + 1
3. x = x * 1
4. x = 1% x

A program attempts to generate as many permutations as possible of the string, 'abcd' by pushing the characters a, b, c, d in the same order onto a stack, but it may pop off the top character at any time. Which one of the following strings cannot be generated using this program?

1. abcd
2. dcba
3. cabd
4. cbad

Suppose a C program has floating constant 1.414, what is the best way to convert this 'float' data type?

1. (float)1.414
2. Float (1.414)
3. 1.414f or 1.414F
4. 1.414 itself of 'float' data type, i.e., nothing else required

What is the output of the following program?
void main(){
  int a;
  a=1;
  while(a<=1)
    if(a%2)
      printf("%d", a++);
    else
      printf("%d", ++a);
  printf("%d", a+10);
}

1. 011
2. 012
3. 111
4. 112

What is the output of this C code?
#include<stdio.h>
void main()
{
  int a = 5 * 3 + 2 - 4;
  printf("%d", a);
}

1. 13
2. 14
3. 12
4. 16

What is the output of this C code?
#include<stdio.h>
void main()
{
  int b = 6;
  int c = 7;
  int a = ++b+c--;
  printf("%d", a);
}

1. Run-time error
2. 15
3. 13
4. 14

What is the output of this C code?
#include<stdio.h>
void foo(int*);
int main()
{
  int i = 10;
  foo((&i)++);
}
void foo(int* p)
{
  printf("%d ", *p);
}

1. 10
2. some garbage value
3. compile-time error
4. segmentation fault/code crash

User-defined data type can be derived by

1. struct
2. enum
3. typedef
4. All of the above

As per C language standard, which of the following is/are not keyword(s)? Pick the best statement:
auto, make, main, sizeof, elseif

1. make, main
2. sizeof
3. auto, make
4. make, main, elseif

What is the output of this C code (when 1 is entered)?
#include<stdio.h>
void main()
{
  double ch;
  printf ("enter a value between 1 to 2:");
  scanf("%lf", &ch);
  switch (ch)
  {
    case 1:
      printf("1");
      break;
    case 2:
      printf("2");
      break;
  }
}

1. Compile-time error
2. 1
3. 2
4. None of the above

What do you mean by pre-processor? Also explain the use of %i format specifier w.r.t, scanf() function.

Write a C program to Perform binary search on a set of given sorted numbers.

Write a C program to find the number of lines in a text file.

Explain pointer arithmetic with the help of suitable diagrams.

Explain the following bitwise operators:
(a) Bitwise AND
(b) Bitwise OR
(c) Bitwise XOR
(d) Bitwise Left Shift

What do you mean by 'call by reference'? Explain with the help of a function which swaps two numbers.

Write a C program of the following:
(a) Reverse a string without using strrev().
(b) Concatenate two strings without using strcat()

Write a 'recursive' C program to print the following:
(a) GCD of two numbers
(b) Merge-sort of a set of given numbers