SimpleCPrograms.pptVIP

Assignment Statements Assignment operators must not be confused with equality. Copyright ? 2012 Pearson Education, Inc. Arithmetic Expressions Expressions appearing in assignmentstatements for numeric variables may be simple literals (e.g. x1 = 10.4;), reading the value stored in a variable (e.g. x2= x1;), or be more complex expressions involving the evaluation of one or more operators (e.g. x1 = -3.4*x2 + 10.4). Copyright ? 2012 Pearson Education, Inc. Arithmetic Operators Addition + Subtraction - Multiplication * Division / Modulus % Modulus returns remainder of division between two integers Example 5%2 returns a value of 1 Copyright ? 2012 Pearson Education, Inc. Operator Basics The five operators (* / % + -) arebinary operators - operators that require two arguments (i.e. operands). C++ also include operators that require only a single argument – unary operators. For example, a plus or a minus sign preceding an expression can be unary operators: (e.g. -x2). Copyright ? 2012 Pearson Education, Inc. Integer Division Division between two integers resultsin an integer. The result is truncated, not rounded Example: The expression 5/3 evaluates to 1 The expression 3/6 evaluates to 0 Copyright ? 2012 Pearson Education, Inc. Mixed Operations Binary operations on two values ofsame type yield a value of that type (e.g. dividing two integers results in an integer). Binary operations between values of different types is a mixed operation. Value of the lower type must be converted to the higher type before performing operation. Result is of the higher type. Copyright ? 2012 Pearson Education, Inc. Casting The cast operator. The cast operator is a unary operator that requests that the value of the operand be cast, or changed, to a new type for the next computation. The type of the operand is not affected. Example: int count(10), sum(55); double average; average = (double)sum/count; Copyright ? 2012 Pearson Education, Inc. Memory snapshot: int count int sum