Relation between Pointers and Functions in C

Relation between Pointers and Functions

• Passing a pointer to a function is known as call by reference and function works on actual variables in that case
• void copy(char *s1, char*s2) { while ((*s1++ = *s2++) != ‘\0’ }
• Pointer parameters are very common in string functions like above
• *s++ and *++s are different!
• type (*ptr)() is a pointer to a function with return type as type
• It is different than type *ptr()
• double (*p1)(), mul();
• p1 = mul;
• (*p1) (x,y) is same as mul(x,y)
• It is used in system programming