C language allows a programmer to create user defined data types. It provides 2 keywords to do so; typedef and enum. typedef typedef allows a programmer to define an identifier that would represent an existing data type. Therefore, the identifier so defined can be later used to declare variables. The general syntax to do so … Read more
After a variable is declared it may be required to initialize it. Initialization of a variable means assigning some value to it. However, technically there is no problem with using a variable without initializing it. But logically it is wrong. When a variable is declared but not initialized it contains some random bogus but valid … Read more
All the variables that are to be used in a program must be declared first. The declaration of variable means specifying the identifier (i.e. variable name), the type and width of data it will hold (i.e. data type) to the compiler. The general syntax of declaring a variable in C is as follows: Also, multiple … Read more
The Character data type is used to specify a variable that will contain characters from ASCII table like ‘A’, ‘%’, and so on. The keyword used by C language to specify some variable as character is char. The width of memory allocated to a character variable is 8 bits. The char variable stores the character … Read more
The Floating Point data type is used to specify a variable that will contain real numbers, i.e. any positive or negative number with fractional part. The keyword used by C language to specify some variable as real is float. The width of memory allocated to floating point variable is 32 bits irrespective of the word … Read more
The Integer data type is used to specify a variable that will contain only integer values, i.e. any positive or negative number without fractional part. The keyword used by C language to specify some variable as integer is int. The width of memory allocated to an integer variable is generally one word. However, the word … Read more
The wide variety of data types supported by C language can be classified into 3 classes: 1. Primary Data Types 2. User-defined Data Types 3. Derived Data Types C supports 4 primary data types which include integer, character, floating point and double-precision floating point. C also supports creating user-defined data types using keywords typedef and … Read more
Variables are a way of reserving memory to hold some data and assign names to them so that we don’t have to remember the numbers like 316976 and instead we can use the memory location by simply referring to the variable name. Every variable is mapped to a unique memory address. However, this is not … Read more
A Variable represents some memory location which is used to store some value. Unlike constants, a variable may take different values at during times during execution. In other words, the value within a variable can be changed; hence the name. A Variable-name is an identifier token that follows the syntax rules for creating identifier, however … Read more
Constants are those tokens in C language whose value is fixed and does not change during the execution of a program. There are various types of constants in C. Integer Constants These constants refer to a sequence of digits. Any representation can be used to specify an integer constant. Table -1 shows ways to specify … Read more