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basic of c
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basic of c
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// double slash are used for commenting in the code. Comments are hints that we add to our program to make our code easier to understand.
//They are mainly used for humans to read and understand the code.
//semicolon (;) at the end is mandatory in c programming. it indicates the end of the statment
*keywords
Keywords are predefined, reserved words used in programming that have special meanings to the compiler. Keywords are part of the syntax and they cannot be used as an identifier.
32 reserved keyword for c:
auto, break, case, char, const, continue, enum, if, default, do, double, else, extern, float, for, goto, int, long,
register, return, chart, signed, size of, static, struct, switch, type text, union, unsigned, void, volatile, while
*Literals
In programming, we will be dealing with different types of data. All these fixed data (values) that we can use directly in our program are called literals.
Different Types of Literals
|
|-----------------------------------|---------------------------------|
Integer Literals Floating-point Literals Character Literals
(Numbers without decimal parts (No. that have a decimal part (A single character that is enclosed
For ex.25, -75, 50) For ex.21.5, 32.9, 9.0) within single quotation marks
for ex.'Aditya 4289', '4', 'd')
*Variables
Variables are containers to store data like numbers and characters
types of variables
1.create variables
2.print variables
3.change values assigned to variable
The syntax to declare variables in C programming is:
int age; or int main;
in above example age and main are variable and int is keyword
we use printf function to print variables in c programming
%d is used for format specifier
%if is used for double specifier
*data type
Data types determine the type of data associated with variables
1. int type - used for integer values without decimal. for ex 54, -21, 32, etc
2. double type - used for floating-point numbers with decimal. for ex 51.9, 62.5, etc
3. char type - used for characters. for ex 'A', '+', etc