C++ operators and their precedence level

C++ operators and their precedence level

I do not have the exact number of operators in C++, but some are as follows:

1. Assignment operator (=)
2. Arithmetic operators [(+)addition, (-)subtraction, (*)multiplication, (/)division, (%)modulo]
3. Increase operator (++) and Decrease operator (–)
4. Relational and Equality Operators [(==)equal to, (!=)not equal to, (>),greater than, (<)less than, (>=)greater than or equal to, (<=)less than or equal to]
5. Logical operators [(!)not, (&&)and, (||)or]
6. Conditional operator (?)
7. Comma operator (,)
8. Bitwise operators [(&)bitwise AND, (|)bitwise inclusive OR, (^)bitwise exclusive OR, (~)unary complement, (<<)shift left, (>>)shift right]

From most priority to lowest priority, the order is as follows:

Sample program that shows the meaning of precedence:

                #include (iostream>

                using namespace std;

                int main ()

                {

                                int a=10 ,b=20, c=30, d, e, f;

                                d=a+a*b-c;

                                e=(a*b+a)/c;

                                f=(a*(b/c));

                                cout << d << endl;

                                cout << e << endl;

                                cout << f << endl;

                                return (0);

                }

The output of the program is:

180

7

0

In the given program:

The statement a+a*b-c; a*b is evaluated first then the operators +and – which gives the final result of 180.

In the statement (a*b+a)/c, the operators inside the parenthesis is first evaluated. The multiplication operator is evaluated before the addition operator. Then the last operator is the division which gives the final result of 7.

In the last statement parentheses are also used, the innermost expression is evaluated first giving the result of 0 then multiplied with the last variable which gives the final result of 0.