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Extra resources for A quick introduction to the C language

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Always keep the commentaries current with the code that they are supposed to comment. There is nothing more frustrating than to discover that the commentary was actually misleading you, because it wasn’t updated when the code below changed, and actually instead of helping you to understand the code it contributes further to make it more obscure. 2. Do not comment what are you doing but why. For instance: record++; // increment record by one This comment doesn’t tell anything the C code doesn’t tell us anyway.

A function may change the values of its parameters, but these changes cannot affect the values of the arguments. On the other hand, it is possible to pass a pointer to an object, and the function may change the value of the object pointed to. A parameter declared to have array or function type is converted to a parameter with a pointer type. The order of evaluation of the actual arguments, and sub expressions within the actual arguments is unspecified. For instance: fn( g(), h(), m()); Here the order of the calls to the functions g(), h() and m() is unspecified.

Volatile int hardware_clock; Declare the prototype for the given function. See prototypes. double sqrt(double x); Declare a function pointer called “id” with the given return type and arguments list void (*fn)(int) Declare a label. Definition of a function with return type and arguments See Function declarations. lab1: int add1(int x) { return x+1;} Redefine one of the operators like +, * or others so that instead of doing the normal operation, this function is called instead. This is an extension to the C language proposed by lcc-win32 and is NOT in the language standard.

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