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C Programming :: Const

Const - Point Out Errors
Const - Find Output of Program

  1. What will be the output of the program?

     #include 
 #include 

  union employee
  {   
      char name[15];  
      int age;    
      float salary;
 }; 
  const union employee e1;

  int main()
  {    
       strcpy(e1.name, "K");     
       printf("%s %d %f", e1.name, e1.age, e1.salary); 
      return 0; 
 }

    2. A.

    Error: RValue required
    B.

    Error: cannot convert from 'const int *' to 'int *const'
    C.

    Error: LValue required in strcpy
    D.

    No error

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  2. What will be the output of the program?

       #include
   int fun(int **ptr); 
 
  int main() 
 {    
     int i=10;    
     const int *ptr = &i;    
     fun (&ptr);  
     return 0; 
}   
int fun(int **ptr) 
{
   int j = 223;  
   int *temp = &j;   
   printf("Before changing ptr = %5x\n", *ptr);    
   const *ptr = temp;       
   printf("After changing ptr = %5x\n", *ptr);  
   return 0;
 }

    3. A.

    Address of i
    Address of j
    B.

    10
    223
    C.

    Error: cannot convert parameter 1 from 'const int **' to 'int **'
    D.

    Garbage value

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  3. What will be the output of the program?

     #include 
 int main()
 {   
     const int x=5;    
     const int *ptrx;   
     ptrx = &x;     
     *ptrx = 10;    
     printf("%d\n", x);     
     return 0;
 }

    4. A.

    5
    B.

    10
    C.

    Error
    D.

    Garbage value

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  4. What will be the output of the program in TurboC?

      #include 
  int fun(int **ptr);

  int main()
  {     
       int i=10, j=20;   
       const int *ptr = &i;     
       printf(" i = %5X", ptr);     
       printf(" ptr = %d", *ptr);     
       ptr = &j; 
       printf(" j = %5X", ptr);     
       printf(" ptr = %d", *ptr);     
       return 0;
  }

    5. A.

    i= FFE2 ptr=12 j=FFE4 ptr=24
    B.

    i= FFE4 ptr=10 j=FFE2 ptr=20
    C.

    i= FFE0 ptr=20 j=FFE1 ptr=30
    D.

    Garbage value

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  5. What will be the output of the program?

     #include 
 int main()
 {    
    const char *s = "";   
    char str[] = "Hello";    
    s = str;    
    while(*s)        
       printf("%c", *s++);     
    return 0;
 }

    6. A.

    Error
    B.

    H
    C.

    Hello
    D.

    Hel

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  6. What will be the output of the program (in Turbo C)?

     #include 
 int fun(int *f)
 {   
      *f = 10;   
      return 0;
 }
 int main() 
 { 
    const int arr[5] = {1, 2, 3, 4, 5};    
    printf("Before modification arr[3] = %d", arr[3]);  
    fun(&arr[3]);   
    printf("\nAfter modification arr[3] = %d", arr[3]);     
    return 0;
 }

    7. A.

    Before modification arr[3] = 4
    After modification arr[3] = 10
    B.

    Error: cannot convert parameter 1 from const int * to int *
    C.

    Error: Invalid parameter
    D.

    Before modification arr[3] = 4
    After modification arr[3] = 4

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  7. What will be the output of the program?

     #include 

 int main()
 {   
      const int i=0;     
      printf("%d\n", i++);
      return 0; 
 }

    8. A.

    10
    B.

    11
    C.

    No output
    D.

    Error: ++needs a value

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  8. What will be the output of the program?

     #include

  int main()
  {    
       const c = -11;  
       const int d = 34;      
       printf("%d, %d\n", c, d);     
       return 0;
   }

    9. A.

    Error
    B.

    -11, 34
    C.

    11, 34
    D.

    None of these

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