C Tutorial  Mathematical operators  
Introduction to C language Integer types Char constants Int constants Type combination and promotion Int overflow Floating point types Comments Variables Assignment operator Truncation Int vs float arithmatic Mathematical operators Unary Increment Operators Pre and Post Variations C Programming Cleverness and Ego Issues Relational Operators Logical Operators Bitwise Operators Other Assignment Operators

Mathematical Operators C includes the usual binary and unary arithmetic operators. See the appendix for the table of precedence. Personally, I just use parenthesis liberally to avoid any bugs due to a misunderstanding of precedence. The operators are sensitive to the type of the operands. So division (/) with two integer arguments will do integer division. If either argument is a float, it does floating point division. So (6/4) evaluates to 1 while (6/4.0) evaluates to 1.5  the 6 is promoted to 6.0 before the division.
+ Addition
 Subtraction
/ Division
* Multiplication
% Remainder (mod) Want more information and Video ???

