by Dinesh Thakur Category: Function and Pointer

Except a few, most of the programs in C may be written with or without pointers. Then the question arises "Why use pointers if you can do without them?” Pointers are considered to be useful tools in programming because of the following reasons:

 
by Dinesh Thakur Category: Function and Pointer

To manipulate data using pointers, the C language provides two operators: address (&) and dereference (*). These are unary prefix operators. Their precedence is the same as other unary operators which is higher than multiplicative operators.

 
by Dinesh Thakur Category: Function and Pointer

A goto statement implements a local jump of program execution, and the longjmp() and setjmp() functions implement a nonlocal, or far, jump of program execution. Generally, a jump in execution of any kind should be avoided because it is not considered good programming practice to use such statements as goto and longjmp in your program.

 
by Dinesh Thakur Category: Function and Pointer

pointer is a very powerful and sophisticated feature provided in the C language. A variable defined in a program the compiler allocates a space in the memory to store its value. The number of bytes allocated to the variable depends on its type. For instance, a character is allocated 1 byte, an int is, in general, allocated 4 bytes, and a float is also allocated 4 bytes on a typical 32-bit system. The memory in RAM is grouped into bytes; each byte has 8 bits of memory. Bytes are sequentially numbered. Thus, each byte is associated with a number which is its address. When a variable is declared, a block of memory is allocated to store its value. The address of a variable is the byte number of the first byte of the memory block allocated for value storage. The value of a pointer to the variable is also the address where the value is stored, i.e., its value is the byte number of the first byte of the memory block where the value of variable is stored. A pointer to a data item is nothing but the address of that data item. Address of a variable may be determined by application of address-of operator (&).We can store this address in a variable, called the pointer variable, and use it to manipulate that data item. For instance, let Marks be a variable of type int. On a 32-bit system, Marks would be allocated a memory block of size 4 bytes for storing its value.

 
by Dinesh Thakur Category: Function and Pointer

The return statement is used to terminate the execution of a function and transfer program control back to the calling function. In addition, it can specify a value to be returned by the function. A function may contain one or more return statements. The general format of the return statement is given below.

 
by Dinesh Thakur Category: Function and Pointer

The declaration of a pointer variable in C, comprises the type of pointer followed by indirection operator (*) which is followed by an identifier for the pointer. The declaration is done as follows:

 
by Dinesh Thakur Category: Function and Pointer

Printf function always returns the number of characters printed by the printf function. Let us see this in brief with an example:

 
by Dinesh Thakur Category: Function and Pointer

If elements of an array are two-dimensional arrays, the array is called a three-dimensional array. Therefore, a three-dimensional array may be considered as an array of matrices. Let Arm be a 3-dimensional array or an array of matrices. The declaration of pointer and its initialization is carried out as given below.

 
by Dinesh Thakur Category: Function and Pointer

When a C program is compiled, the compiler allocates memory to store different data elements such as constants, variables (including pointer variables), arrays and structures. This is referred to as compile-time or static memory allocation. There are several limitations in such static memory allocation:

 

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About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.



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