A pointer is a variable that contains the address of a variable. Pointers are much used in C, partly because they are sometimes the only way to express a computation, and partly because they usually lead to more compact and efficient code than can be obtained in other ways Pointer Notation Consider the declaration int … Read more
Function Declaration and Prototypes Any C function by default returns an int value. More specifically, whenever a call is made to a function, the compiler assumes that this function would return a value of the type int. If we desire that a function should return a value other than an int, then it is necessary … Read more
The return statement serves two purposes: On executing the return statement it immediately transfers the control back to the calling program It returns the value present in the parentheses after return, to th3e calling program. In the above program the value of sum of three numbers is being returned. There is no restriction on the … Read more
A function is a self-contained block of statements that perform a coherent task of some kind. Every C program can be thought of as a collection of these functions Example of Function in C main( ){message( ) ;printf ( “\nCry, and you stop the monotony!” ) ;}message( ){printf ( “\nSmile, and the world smiles with … Read more
The control statement that allows us to make a decision from the number of choices is called a switch, or more correctly a switch-case-default, since these three keywords go together to make up the control statement. They most often appear as follows: The integer expression following the keyword switch is any C expression that will … Read more
There is a minor difference between the working of while and do-while loops. This difference is the place where the condition is tested. The while tests the condition before executing any of the statements within the while loop. As against this, the do-while tests the condition after having executed the statements within the loop The … Read more
In some programming situations we want to take the control to the beginning of the loop, bypassing the statements inside the loop, which have not yet been executed. The keyword continue allows us to do this. When continue is encountered inside any loop, control automatically passes to the beginning of the loop A continue is … Read more
The versatility of the computer lies in its ability to perform a set of instructions repeatedly. This involves repeating some portion of the program either a specified number of times or until a particular condition is being satisfied This repetitive operation is done through a loop control instructions There are three methods by way of … Read more
The conditional operators ? and : are sometimes called ternary operators since they take three arguments. In fact, they form a kind of foreshortened if-then-else. Their general form is expression 1 ? expression 2 : expression 3 What this expression says is: “if expression 1 is true (that is, if its value is non-zero), then … Read more
C allows usage of three logical operators, namely, &&, || and !. These are to be read as ‘AND’ ‘OR’ and ‘NOT’ respectively Consider the following example The marks obtained by a student in 5 different subjects are input through the keyboard. The student gets a division as per the following rules Percentage above or … Read more