• C supports rich set of operators
• =, +, -, *, &, etc
• An operator is a symbol that tells computer to perform certain math or logical manipulations
• They are used to manipulate data and variables
• They form a part of either math or logical expressions

• Arithmetic
• Relational
• Logical
• Assignment
• Increment and Decrement
• Conditional
• Bitwise
• Special

• All basic math operators provided!
• Unary and binary minus and ANSI plus
• Difference between / and %
• The integer expression
• The truncation to integer value in IE
• Real and Mixed mode arithmetic

• Taking decisions based on comparison
• When math expressions surrounds RO, they are evaluated before applying RO

• Relational operators are combined using logical operators
• It yields value 1 or 0 like relational operator
• && is logical AND
• || is logical OR
• ! Means logical NOT
• Result is based on truth table of operators

• =, +=, -=, *=, /= are assignment operators
• V op = exp is same as v = v op exp
• Op= here is known as shorthand assignment operator
• The ++ and - - operators
• The difference between prefix and postfix operators when used in assignment

• x = (a > b) ? a : b
• Bitwise operators

• X is 13 so X is 0000 0000 0000 1101 
• y is 25 so y is   0000 0000 0001 1001
• Z = x & y is     0000 0000 0000 1001 = 9

• Comma (,), sizeof, pointer operators (& and *), member selection operators (. And ->)
• Value = (x=10, y=5, x+y);
• T=x,x=y,y=t;
• In for and while loops
• Sizeof(sum), sizeof (long int), sizeof (235L)
• C = ++a + b and c = a++ + b are different 

• Left to right unless parenthesis
• Priority of *, / and % is higher then +,-
• Two passes are needed to evaluate an exp
• Approximation for real numbers is problem
• Division by zero yields error
• Avoiding overflow and underflow errors
• Arithmetic type conversion to higher type

Casting

• Need to force other than default conversion 
• Ratio = female_no / male_no
• Examples
• A = (int) 21.3 / int (4.5)
• B = (double) sum / n
• Y = (int) (a+b)
• P = cos ((double(x))
• Priority and associativity