What is Data Types and Functions?
- 1. What are data types ? int a=10; Datatype Variable Value or data Semi-colon
- 2. What are data types ? It decides which type of value variable will store i.e. integer, float, character or decimal value.
- 3. There are 3 types of data type • Primary or Primitive Datatype • Derived or Non-Primitive Datatype • User Defined Datatype
- 4. Primary or Primitive Datatype Data types that have been given by the compiler or can be said as inbuilt in it, called as primary data types or primitive data types. • Integer type value • Floating point type value • Character type value • Void type value
- 5. • Integer type value Datatype Size(16 bit compiler) Range Format specifier int or signed int 2 Byte -32767 to 32768 %d unsigned int 2 Byte 0 to 65535 %u short int 1 Byte -128 to 127 %hd unsigned short int 1 Byte 0 to 255 %hu long int or signed int 4 Byte -2,147,483,648 to 2,147,483,647 %ld unsigned long int 4 Byte 0 to 4,294,967,295 %lu
- 6. • Floating point type value Datatype Size(16 bit compiler) Range Format specifier float 4 Bytes 1.2E-38 to 3.4E+38 %f double 8 Bytes 2.3E-308 to 1.7E+308 %lf long double 10 Bytes 3.4E-4932 to 1.1E+4932 %Lf Precision 6 places 10 places 15 places
- 7. • Character type value and void type value Datatype Size(16 bit compiler) Range Format specifier char 1 Byte -127 to 128 %c void means no value to is usually used with functions when function is not returning any type of value it is set as void. Example-: void addition () { //code }
- 8. What is Function ? A block of code wrapped within a single name is called as functions, it is used to do some specific task. Types of function:- 1. Standard library functions 2. User defined functions Standard library functions that have been already defined, in the C library within the header files, that can directly be used like printf(), scanf(). Functions that is defined by the user, is called as user defined functions, it is a block of code that is used to do some specific task.
- 9. User defined functions A block of code wrapped within a single name is called as functions, it is used to do some specific task. Syntax:- return_type function_name(parameters) { //block of code } Let’s see an example of writing different kinds of function to add two numbers.
- 10. void addition(int a,int b) { int sum =a+b; printf(“%d”,sum); } int addition(int a,int b) { int sum =a+b; return sum; } void addition() { int a=10, b=20; int sum =a+b; printf(“%d”,sum); } int addition(void) { int a=10, b=20; int sum =a+b; return sum; } No return type with parameter No return type without parameter return type with parameter return type without parameter