Sample Technical Paper

Sample Technical Paper

• Point out error, if any, in the following program
  main()
  {
  int i=1;
  switch(i)
  {
  case 1:
  printf(“\nRadioactive cats have 18 half-lives”);
  break;
  case 1*2+4:
  printf(“\nBottle for rent -inquire within”);
  break;
  }
  }
  Ans. No error. Constant expression like 1*2+4 are acceptable in cases of a switch.

• Point out the error, if any, in the following program
  main()
  {
  int a=10,b;
  a>= 5 ? b=100 : b=200;
  printf(“\n%d”,b);
  }
  Ans. lvalue required in function main(). The second assignment should be written in parenthesis as follows:
  a>= 5 ? b=100 : (b=200);

• In the following code, in which order the functions would be called?
  a= f1(23,14)*f2(12/4)+f3();
  a) f1, f2, f3 b) f3, f2, f1
  c) The order may vary from compiler to compiler d) None of the above

• What would be the output of the following program?
  main()
  {
  int i=4;
  switch(i)
  {
  default:
  printf(“\n A mouse is an elephant built by the Japanese”);
  case 1:
  printf(” Breeding rabbits is a hair raising experience”);
  break;
  case 2:
  printf(“\n Friction is a drag”);
  break;
  case 3:
  printf(“\n If practice make perfect, then nobody’s perfect”);
  }
  }
  a) A mouse is an elephant built by the Japanese b) Breeding rabbits is a hare raising experience
  c) All of the above d) None of the above

• What is the output of the following program?
  #define SQR(x) (x*x)
  main()
  {
  int a,b=3;
  a= SQR(b+2);
  printf(“%d”,a);
  }
  a) 25    b) 11 c) error d) garbage value

• In which line of the following, an error would be reported?
  1. #define CIRCUM(R) (3.14*R*R);
  2. main()
  3. {
  4. float r=1.0,c;
  5. c= CIRCUM(r);
  6. printf(“\n%f”,c);
  7. if(CIRCUM(r))==6.28)
  8. printf(“\nGobbledygook”);
  9. }
  a) line 1 b) line 5 c) line 6    d) line 7

• What is the type of the variable b in the following declaration?
  #define FLOATPTR float*
  FLOATPTR a,b;
  a) float b) float pointer c) int d) int pointer

• In the following code;
  #include<stdio.h>
  main()
  {
  FILE *fp;
  fp= fopen(“trial”,”r”);
  }
  fp points to:
  a) The first character in the file.
  b) A structure which contains a “char” pointer which points to the first character in the file.
  c) The name of the file. d) None of the above.

• We should not read after a write to a file without an intervening call to fflush(), fseek() or rewind() < TRUE/FALSE>
  Ans. True

•  If the program (myprog) is run from the command line as myprog 1 2 3 , What would be the output?
  main(int argc, char *argv[])
  {
  int i;
  for(i=0;i<argc;i++)
  printf(“%s”,argv[i]);
  }
  a) 1 2 3    b) C:\MYPROG.EXE 1 2 3
  c) MYP d) None of the above

• If the following program (myprog) is run from the command line as myprog 1 2 3, What would be the output?
  main(int argc, char *argv[])
  {
  int i,j=0;
  for(i=0;i<argc;i++)
  j=j+ atoi(argv[i]);
  printf(“%d”,j);
  }
  a) 1 2 3     b) 6 c) error d) “123”

• If the following program (myprog) is run from the command line as myprog monday tuesday wednesday thursday,
  What would be the output?
  main(int argc, char *argv[])
  {
  while(–argc >0)
  printf(“%s”,*++argv);
  }
  a) myprog monday tuesday wednesday thursday     b) monday tuesday wednesday thursday
  c) myprog tuesday thursday d) None of the above

• In the following code, is p2 an integer or an integer pointer?
  typedef int* ptr
  ptr p1,p2;
  Ans. Integer pointer

• Point out the error in the following program
  main()
  {
  const int x;
  x=128;
  printf(“%d”,x);
  }
  Ans. x should have been initialized where it is declared.

• What would be the output of the following program?
  main()
  {
  int y=128;
  const int x=y;
  printf(“%d”,x);
  }
  a) 128 b) Garbage value c) Error d) 0

•  What is the difference between the following declarations?
  const char *s;
  char const *s;
  Ans. No difference

• What would be the output of the following program?
  main()
  {
  char near * near *ptr1;
  char near * far *ptr2;
  char near * huge *ptr3;
  printf(“%d %d %d”,sizeof(ptr1),sizeof(ptr2),sizeof(ptr3));
  }
  a) 1 1 1         b) 1 2 4       c) 2 4 4    d) 4 4 4

• If the following program (myprog) is run from the command line as myprog friday tuesday sunday,
  What would be the output?
  main(int argc, char*argv[])
  {
  printf(“%c”,**++argv);
  }
  a) m     b) f c) myprog d) friday

• If the following program (myprog) is run from the command line as myprog friday tuesday sunday,
  What would be the output?
  main(int argc, char *argv[])
  {
  printf(“%c”,*++argv[1]);
  }
  a) r b) f c) m d) y

•  If the following program (myprog) is run from the command line as myprog friday tuesday sunday,
  What would be the output?
  main(int argc, char *argv[])
  {
  while(sizeofargv)
  printf(“%s”,argv[–sizeofargv]);
  }
  a) myprog friday tuesday sunday b) myprog friday tuesday
  c) sunday tuesday friday myprog d) sunday tuesday friday

•  Point out the error in the following program
  main()
  {
  int a=10;
  void f();
  a=f();
  printf(“\n%d”,a);
  }
  void f()
  {
  printf(“\nHi”);
  }
  Ans. The program is trying to collect the value of a “void” function into an integer variable.

•  In the following program how would you print 50 using p?
  main()
  {
  int a[]={10, 20, 30, 40, 50};
  char *p;
  p= (char*) a;
  }
  Ans. printf(“\n%d”,*((int*)p+4));

•  Would the following program compile?
  main()
  {
  int a=10,*j;
  void *k;
  j=k=&a;
  j++;
  k++;
  printf(“\n%u%u”,j,k);
  }
  a) Yes b) No, the format is incorrect
  c) No, the arithmetic operation is not permitted on void pointers
  d) No, the arithmetic operation is not permitted on pointers

• According to ANSI specifications which is the correct way of declaring main() when it receives command line arguments?
  a) main(int argc, char *argv[]) b) main(argc,argv) int argc; char *argv[];
  c) main() {int argc; char *argv[]; } d) None of the above

• What error would the following function give on compilation?
  f(int a, int b)
  {
  int a;
  a=20;
  return a;
  }
  a) missing parenthesis in the return statement b) The function should be declared as int f(int a, int b)
  c) redeclaration of a    d) None of the above

• Point out the error in the following program
  main()
  {
  const char *fun();
  *fun()=’A’;
  }
  const char *fun()
  {
  return “Hello”;
  }
  Ans. fun() returns to a “const char” pointer which cannot be modified

• What would be the output of the following program?
  main()
  {
  const int x=5;
  int *ptrx;
  ptrx=&x;
  *ptrx=10;
  printf(“%d”,x);
  }
  a) 5      b) 10 c) Error d) Garbage value

• A switch statement cannot include
  a) constants as arguments b) constant expression as arguments
  c) string as an argument d) None of the above

• How long the following program will run?
  main()
  {
  printf(“\nSonata Software”);
  main();
  }
  a) infinite loop     b) until the stack overflows
  c) All of the above d) None of the above

• On combining the following statements, you will get char*p; p=malloc(100);
  a) char *p= malloc(100) b) p= (char*)malloc(100)
  c) All of the above d) None of the above

• What is the output of the following program?
  main()
  {
  int n=5;
  printf(“\nn=%*d”,n,n);
  }
  a) n=5   b) n=5   c) n= 5 d) error