expected '=', ',', ';', 'asm' or '__attribute__' before '.' token

Question

Could not able to solve this.. I am implementing a queue. After writing the complete code I

Answer 1

As @Naveen said you can't assign to a member of a struct that is in global scope. Depending on the version of C though you could do this:

struct Queue q = {0,0};

or

struct Queue q = {.front = 0, .rear = 0 };

Answer 2

Q.front = 0; is not a simple initializer, it is executable code; it cannot occur outside of a function. Use a proper initializer for Q.

struct Queue Q = {0, 0};

or with named initializer syntax (not available in all compilers, and as yet only in C):

struct Queue Q = {.front = 0, .rear = 0};

Answer 3

You can't initialize variable using Q.front = 0; Q.rear = 0; in global scope. Those statements should be inside main in your case.