Introduction to C language (2) Statements and operators

Introduction to C language (2) Statements and operators

The basic statements in C language are similar to those in Java.

• Loop statements (do while, while,)
• Conditional statements (if, if-else, switch)
• Goto statement (for example, defining an Exit mark outside the loop:; you can use goto Exit in the loop; jumping out of the loop)

   

  [Plain] 
  1. For (int I = 0; I <5; I ++)
  2. {
  3. If (I = 2) goto exit;
  4. Printf (I = % d, I );
  5. }
  6. Exit :;
  7. Printf (admin );
     

      

     Arithmetic Operators

     • + Addition Operators
       • -Subtraction operator or negative operator
         • * Multiplication Operator
           • /Division Operator
             • % Modulo operator, or the remainder operator, must be an integer on both sides of %

                

               Relational operators

               • <Less than Operator
                 • <= Less than or equal to the operator
                   • > Greater than Operator
                     • > = Operator greater than or equal
                       • = Equals Operator
                         • ! = Not equal to operator

                            

                           No boolean type in C Language

                           In C language, if the result of the relational operation is true, 1 is returned. If false, 0 is returned.

                           Int a1 = 5> 4; // 1

                            

                           Int a2 = 5 <4; // 0

                           * Note that in C, any non-0 value is true. Only 0 value is assumed as if (-1 ){}

                           If (a = 0 ){}

                           In the C language, you can save the result of the relational operation. Therefore, the following statement is valid:

                           Int a = 10;

                           A> 10;

                           A = 0;

                            

                           Logical operators

                           • & Logic and operators
                             • | Logic or operator
                               • ! Logical non-Operator

                                 There are only two results for the logical operation: true if it is true, 1 is returned; false if it is not true, 0 is returned.

                                 Compound assignment operator

                                 • + = Add the value assignment operator. For example, a + = 3 + 1 is equivalent to a = a + (3 + 1)
                                   • -= Minus value assignment operator. For example, a-= 3 + 1 is equivalent to a = a-(3 + 1)
                                     • * = Multiplication and value assignment operator. For example, a * = 3 + 1 is equivalent to a = a * (3 + 1)
                                       • /= Except the value assignment operator. For example, a/= 3 + 1 is equivalent to a = a/(3 + 1)
                                         • % = The remainder assignment operator. For example, a % = 3 + 1 is equivalent to a = a % (3 + 1)

                                           Auto-increment and auto-increment Operators

                                           • ++ Auto-increment operator. For example, a ++ and ++ a are equivalent to a = a + 1.
                                             • -- Auto-subtraction operator. Such as a --, -- a, are equivalent to a = A-1

                                               Comma operator and comma expression

                                               * The comma operator is mainly used to connect expressions, such:

                                               Int a = 9;

                                               Int B = 10;

                                               A = a + 1, B = 3*4;

                                               The operation procedure of the comma expression is: from left to right, first calculate expression 1, then calculate expression 2,..., and finally calculate expression n

                                               * The value of the entire comma expression is the value of the last expression c = (++ a, a * = 2, B = a * 5); <==> c = B;

                                               Operator: int a = (B> 5 )? 10: 9;