Now that you know what is void and its int a = 10; In C, we don’t What Does Null Mean in Computer Programming? ptr=&b; // Assigning address of float to void pointer. ****************** \n");    i have a question though: when would it be useful to use a variable of type void* to point to a function? eval(ez_write_tag([[580,400],'circuitstoday_com-box-4','ezslot_17',110,'0','0'])); ptr++; // This statement is invalid and will result in an error because 'ptr' is a void pointer variable. We cannot return values but there is something we can surely return from void functions. void pointer you need to dereference it.     }. Because it is safer. void voidPointer(void) Our webiste has thousands of circuits, projects and other information you that will find interesting. It is invalid and will result in a compilation error. You must know the type of its value in order to dereference it.         for(i = 1; i <= 10; ++i) void *p; // Declarando un puntero void. what consequences will we have to deal with? { “It is invalid and will result in a compilation error.”, It won’t result in compilation error, rather it will compile and will generate a compile time warning: the pointer could be used with a different type. the pointer could be used with a different type        //helper = 2;        //pointer = &symbol; if(helper == 1)    // use an int pointer            printf("The number is a pointer does not have a specific type and could point to But if, by mistake, we call it with arguments we want to be It means “no type”, “no value” or “no parameters”, depending on From a void function, we cannot return any values, but we can return something other than values. pointers in C are a powerful technique, but use it carefully. printf("The value of integer variable is= %d",*( (int*) ptr) );// (int*)ptr - is used for type casting. ****************** \n");    printf("%c",*(char*)a); // Typecasting for character pointer. True, but not completely. Then why do Ex:- char  *ptr;       int  *ptr;      float  *ptr; A pointer variable declared using a particular data type can not  hold the location address of variables of other data types. Press Esc to cancel. Such function does not return a value. When used in a function's parameter list, void indicates that the function takes no parameters. A code snippet is given below.         int sum = 0; So to take the data pointed to by a void pointer we typecast it with the correct type of the data holded inside the void pointers location. But in the case of a void pointer we need to typecast the pointer variable to dereference it. printf("%d",*(int*)a); // If user inputs 1, then he means the data is an integer and type casting is done accordingly. return a value? else if(z==2) function (void) – does not accept parameters In C, if you don’t specify the parameters of a function, it can accept any number of parameters of any type. Eventually, it must be cast to another pointer before it is dereferenced. It could point to an int, char, double, structure or any type. eval(ez_write_tag([[580,400],'circuitstoday_com-medrectangle-3','ezslot_13',108,'0','0']));We have seen about dereferencing a pointer variable in our article – Introduction to pointers in C. We use the indirection operator * to serve the purpose. A void pointer is nothing but a pointer variable declared using the reserved word in C ‘void’. information: \n");        printf("address Some of cases are listed below. different types. Void as a Function Return Type or an error. David Bolton is a software developer who has worked for several major firms, including Morgan Stanley, PwC, BAE Systems, and LCH. If we try to call it and pass one or more arguments, the compiler will give a warning programming? p = &a;         printf("Company int sumFirst10Numbers(void) When used as a function return type, the void keyword specifies that the function does not return a value.         return sum; That’s why, if you need to use a void pointer, you also want to keep track of We use it to indicate that: Learn faster with deeper understanding! from another programming language, this could be confusing at first. You use void as the return type of a method (or a local function) to specify that the method doesn't return a value. the context. eval(ez_write_tag([[250,250],'circuitstoday_com-banner-1','ezslot_18',111,'0','0']));eval(ez_write_tag([[250,250],'circuitstoday_com-banner-1','ezslot_19',111,'0','1'])); thanks a lot! “sumFirst10Numbers” explicitly says that it does not accept parameters. %c.\n", *(char *)pointer);    }. This is probably the most used context of the void keyword. A Guide to "Void" in Computer Programming. else if(z==3) In such a case the programmer can use a void pointer to point to the location of the unknown data type. “A void function cannot return anything” this statement is not always true. printf("%f",*(float*)a); // Typecasting for float pointer         for(i = 1; i <= 10; ++i) given time. This is because a void pointer has no data type associated with it. Now Ex:- void *ptr; // Now ptr is a general purpose pointer variable When a pointer variable is declared using keyword void – it becomes a general purpose pointer variable. ****************** \n");     }. Nice explanation. int sumFirst10Numbers()     printf("Contact         printf("====================\n"); printf("The value of float variable is= %f",*( (float*) ptr) ); eval(ez_write_tag([[300,250],'circuitstoday_com-medrectangle-4','ezslot_16',109,'0','0']));A void pointer can be really useful if the programmer is not sure about the data type of data inputted by the end user. In C, the code takes the form: Note that the parentheses that follow the function name are not optional in any case. When void appears in a pointer declaration, it specifies that the pointer is universal. ptr=&a; // Assigning address of integer to void pointer. A void pointer is nothing but a pointer variable declared using the reserved word in C ‘void’. Support me with your vote ;-), © Copyright 2008-2016 c-programming-simple-steps.com, //Uncomment the next to lines to test test see that             sum += i; When void appears in a pointer declaration, it specifies that the pointer is universal. it still can use the return statement to return control to the caller at any of a function, it can accept any number of parameters of any type. Control structures and statements in C and C++, Quick Sorting algorithm with example code in C/C++/Java languages, Insertion sorting algorithm with example in C/C++/Java languages. A void pointer points to objects of any data type.

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