This document outlines the key features and rules of C programming, emphasizing the necessity of the main() function, the use of semicolons, and the declaration of variables. It details various types of operators, including arithmetic, relational, logical, and assignment operators, as well as provides examples of conditional statements and simple programs. Additionally, it includes examples of C expressions and their arithmetic priorities.

1.  Every C program requires a main() function where
the program execution begins.
 C programs are written in lowercase letters.
 Every program statement in C program must ends
with a semicolon.
 All variables muat be declared for their types
before they are used in the proggram.
 Compiler directive such as #define or #include are
special instructions to the compiler to help it
compile a program. They do not ends with
semicolon.
 Every opening braces must have a corresponding
closing brace.
POINTS TO REMEMBER

2.  An operator is a symbol that tells the compiler
to perform certain mathematical or logical
manipulations. C operators can be classified
into a number of catergories :-
OPERATOR & EXPRESSION

3.  Arithmetic Operators + - * / %
 Relational Operators > < >= <= == !=
 Logical Operators && (and) || (or) !(not)
 Assignment Operators =
 Increment & decrement Operators ++ --
 Ternary Operators exp1? exp2 :exp3;
 Bitwise Operator
 Special Operator ( Sizeof, pointer etc)
TYPES OF OPERATORS

4. Simple Assignment Short hand Assignment
a=a+1 a + = 1
a=a-1 a - = 1
a=a*1 a * = 1
a=a/1 a / = 1
a=a%1 a % = 1
Short hand Assignment Operator

5. Algebric Expression C Expression
a x b –c a * b –c
(m +n) (x – y) (m+ n)*(x-y)
a *b/c
3x2
+2x+1 3*x*x+2*x+1
ARITHMETIC EXPRESSION

6. High Priority * / %
Low Priority + -
1) x=9 -12/3 + 3*2 -1
2) x=9 – 12/6 * (2-1)
3) x=5*16/2 %3
PRECEDENCE OF ARITHMETIC
OPERATOR

7. Types
If else Switch
Conditional statements

8. If(condition)
{
//do something if TRUE
}
else {
//do something if FALSE
}
If else

9. #include<stdio.h>
int main() {
int n;
printf(“Enter a Number”,&n);
if(n%2==0)
printf(“Even Non”);
else
printf(“Odd Non”);
}
Input a number & display it is even
or odd number.

10.  Input two numbers and display their highest.
 Input a number and display it is postive or
negetive number.
 Input age of a person and display he a Voter or
NonVoter.
 Input three angles of a triangle and check
wheather the triangle is possible or not.
 Input marks of a students in thee subject and
display his Total, Average and grade.
Conditional Programs