Reliance Jio C Programming Quiz-1

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Currently there is no PrepInsta Explanation. Did you know?

You can also submit your own version of explanations under user explanation section and also view other submitted explanations by other users.

Currently there is no PrepInsta Explanation. Did you know?

You can also submit your own version of explanations under user explanation section and also view other submitted explanations by other users.

Currently there is no PrepInsta Explanation. Did you know?

You can also submit your own version of explanations under user explanation section and also view other submitted explanations by other users.

Currently there is no PrepInsta Explanation. Did you know?

You can also submit your own version of explanations under user explanation section and also view other submitted explanations by other users.

Currently there is no PrepInsta Explanation. Did you know?

You can also submit your own version of explanations under user explanation section and also view other submitted explanations by other users.

Currently there is no PrepInsta Explanation. Did you know?

You can also submit your own version of explanations under user explanation section and also view other submitted explanations by other users.

Currently there is no PrepInsta Explanation. Did you know?

You can also submit your own version of explanations under user explanation section and also view other submitted explanations by other users.

The C library function strcmp() compares two strings with each other and return the value accordingly.

   int strcmp(const char *str1, const char *str2)

• If, str1 is less than str2 then Return value < 0


• If, str2 is less than str1 then Return value > 0


• If, str1 is equal to str2 then Return value = 0

In C, struct and union types cannot have static members. In C++, struct types are allowed to have static members, but union cannot have static members in C++ also.

Like other primitive data types, we can create an array of structures.Like primitive types, we can have pointer to a structure. If we have a pointer to structure, members are accessed using arrow ( -> ) operator.

A structure variable can be assigned to other using =, but cannot be compared with other using ==

All of them let you define new data types

fp is a pointer of FILE type and FILE is a structure that store following information about opened file.

malloc() and calloc() return void *. We may get warning in C if we don't type cast the return type to appropriate pointer.

In P1, pointer variable x is a local variable to g(), and g() returns pointer to this variable. x may vanish after g() has returned as x exists on stack. So, &x may become invalid. In P2, pointer variable px is being assigned a value without allocating memory to it. P3 works perfectly fine. Memory is allocated to pointer variable px using malloc(). So, px exists on heap, it’s existence will remain in memory even after return of g() as it is on heap.

The expression (p += sizeof(int))[-1] can be written as (p += 4)[-1] which can be written as (p = p+4)[-] which returns address p+3 which is address of fourth element in argv[].

Name of array in C gives the address(except in sizeof operator) of the first element. Adding 1 to this address gives the address plus the sizeof type the array has. Applying the Address-of operator before the array name gives the address of the whole array. Adding 1 to this address gives the address plus the sizeof whole array.

In C/C++, if we initialize an array with fewer members, all remaining members are automatically initialized as 0. For example, the following statement initializes an array of size 1000 with values as 0.

     int arr[1000] = {0};

Empty list in C mean that the parameter list is not specified and function can be called with any parameters. In C, to declare a function that can only be called without any parameter, we should use \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"void fun(void)\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\" As a side note, in C++, empty list means function can only be called without any parameter. In C++, both void fun() and void fun(void) are same.