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CSC_Final_Study_Guide_1

CSC_Final_Study_Guide_1 - Preprocessing and Macros(header...

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Preprocessing and Macros -Common mistakes of dynamic memory allocation: - (header) file inclusion (<stdio.h>) -Use pointer to memory not previously allocated statically or dynamicl - Macro substitution (#define PI 3.14) -Use a pointer to read-only memory (i.e. code) - Conditional compilation (#ifdef DEBUG ... #endif) -Use a pointer to memory that has been freed or deallocated -A preprocessing command is terminated at the end of the line unless continued with a ‘\’ -Forgetting malloc does not initialize memory (#define PI \ -Writing past the end of statically or dynamically allocated memory 3.14) -Freeing dynamically UNallocated memory r * PI == r * 3.14 -Don’t free the same memory twice #define TWOPI 2*PI Const, Enum, Typedef, Booleans, Bitfields, and Unions -Do not terminate #define by ‘;’ or it becomes part of token_sequence -The const keyword indicates to the compiler a value should not change -If a #define contains multiple statements, put the whole thing in braces const float pi = 3.14; -The token_sequence doesn’t need to be a valid statement or expression. const struct person person1 = {“Nate”, 72, 190, ‘M’}; #define TIMES2 *2 -Pointers or variables can be constant, or both -#define can take parameters or arguments (like functions) char * cp = &c; #define DIAM(radius) 2*PI*(radius) char * const cp = &c; (constant pointer)
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