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A function is a block of statements, which is used to perform a specific task. Suppose you are building an application in C language and in one of your program, you need to perform a same task more than once. So in such scenario you have two options – (a) Use the same set of statements every time you want to perform the task (b) Create a function, which would do the task, and just call it every time you need to perform the same task. Using option (b) is a good practice and a good programmer always uses functions while writing codes.

You can’t, really. free() can , but there’s no way for your program to know the trick free() uses. Even if you disassemble the library and discover the trick, there’s no guarantee the trick won’t change with the next release of the compiler.

The const modifier means that this code cannot change the value of the variable, but that does not mean that the value cannot be changed by means outside this code. For instance, in the example in FAQ 8, the timer structure was accessed through a volatile const pointer. The function itself did not change the value of the timer, so it was declared const. However, the value was changed by hardware on the computer, so it was declared volatile. If a variable is both const and volatile, the two modifiers can appear in either order.

Include files can be nested any number of times. As long as you use precautionary measures , you can avoid including the same file twice. In the past, nesting header files was seen as bad programming practice, because it complicates the dependency tracking function of the MAKE program and thus slows down compilation. Many of today’s popular compilers make up for this difficulty by implementing a concept called precompiled headers, in which all headers and associated dependencies are stored in a precompiled state. Many programmers like to create a custom header file that has #include statements for every header needed for each module. This is perfectly acceptable and can help avoid potential problems relating to #include files, such as accidentally omitting an #include file in a module.

Basic example for C Programming Online Help is as follows :

/* function return type is void and doesn't have parameters*/  
void introduction() 
 {     
 printf("Hi\n"); 
 printf("My name is Andrew\n");      
 printf("How are you?");     
 /* there is no return statement inside this function, since its  * return type is void */ 
 }   
 int main() 
 {       
/*calling function*/       
introduction();       
return 0; 
 }

Output:

Hi  My name is Andrew  How are you?

 

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