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Are both pointer statements the same?
void reverse(const char * const sPtr){
}
and
void reverse(const char const *sPtr){
}
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Function pointers in C need to be declared with an asterisk symbol and function parameters (same as function they will point to) before using them in the program. Declaration of function pointers in C includes return type and data type of different function arguments.
Example of pointer in Cint* point = &a; // pointer variable point is pointing to the address of the integer variable a! int a=5; int* point = &a; // pointer variable point is pointing to the address of the integer variable a!
The * symbol indicates that the variable is a pointer. To declare a variable as a pointer, you must prefix it with *. In the example above, we have done a pointer declaration and named ptr1 with the data type integer.
The Basic syntax of function pointers We can think of function pointers like normal C++ functions. Where void is the function's return type. *fun_ptr is a pointer to a function that takes one int argument. It's as if we are declaring a function called *fun_ptr which takes int and returns void .
No.
const char const *sPtr is equivalent to
const char *sPtr.
const char *sPtr say parameter sPtr is a pointer to a const char.
const char * const sPtr is a const pointer to a const char.
Note that this is equivalent in C99 and C11:
(C99, 6.7.3p4) "If the same qualifier appears more than once in the same specifier-qualifier-list, either directly or via one or more typedefs, the behavior is the same as if it appeared only once."
but not in C89 where const char const *sPtr is a constraint violation:
(C90, 6.5.3) "The same type qualifier shall not appear more than once in the same specifier list or qualifier list, either directly or via one or more typedefs."
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