Sonata Technical - C

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