C Operators Assignment Mathematical Relational An operator is a symbol that instructs C to perform some operation, or action, on one or more operands. An operand is something that an operator acts on. In C, all operands are expressions

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Operators

An operator is a symbol that instructs C to perform some operation, or action, on one or more operands. An operand is something that an operator acts on. In C, all operands are expressions. C operators are of following four categories:

  • The assignment operator
  • Mathematical operators
  • Relational operators
  • Logical operators

Assignment Operator

The assignment operator is the equal sign (=). The use of equal sign in programming is different from its use in regular mathematical algebraic relations. If you write

x = y;

In a C program, it does not mean "x is equal to y." Instead, it means "assign the value of y to x." In a C assignment statement, the right side can be any expression, and the left side must be a variable name. Thus, the form is as follows:

variable = expression;

During the execution, expression is evaluated, and the resulting value is assigned to variable.

Mathematical Operators

C's mathematical operators perform mathematical operations such as addition and subtraction. C has two unary mathematical operators and five binary mathematical operators. The unary mathematical operators are so named because they take a single operand. C has two unary mathematical operators.

The increment and decrement operators can be used only with variables, not with constants. The operation performed is to add one to or subtract one from the operand. In other words, the statements ++x; and --y; are the equivalents of these statements:

x = x + 1;
y = y - 1;

binary mathematical operators take two operands. The first four binary operators, which include the common mathematical operations found on a calculator (+, -, *, /), are familiar to you. The fifth operator Modulus returns the remainder when the first operand is divided by the second operand. For example, 11 modulus 4 equals 3 (11 is divided by 4, two times and 3 left over).

Relational Operators

C's relational operators are used to compare expressions. An expression containing a relational operator evaluates to either true (1) or false (0). C has six relational operators.

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Data Recovery Book
 
Chapter 1 An Overview of Data Recovery
Chapter 2 Introduction of Hard Disks
Chapter 3 Logical Approach to Disks and OS
Chapter 4 Number Systems
Chapter 5 Introduction of C Programming
Chapter 6 Introduction to Computer Basics
Chapter 7 Necessary DOS Commands
Chapter 8 Disk-BIOS Functions and Interrupts Handling With C
Chapter 9 Handling Large Hard Disks
Chapter 10 Data Recovery From Corrupted Floppy
Chapter 11 Making Backups
Chapter 12 Reading and Modifying MBR with Programming
Chapter 13 Reading and Modifying DBR with Programming
Chapter 14 Programming for “Raw File” Recovery
Chapter 15 Programming for Data Wipers
Chapter 16 Developing more Utilities for Disks
Appendix Glossary of Data Recovery Terms
 
 
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