iso iec 19770 1

1. Scope 1. This International Standard specifies the form of the C programming language and establishes an interpretation of programming in the C programming language. [Note: international standards are designed to improve the portability of C Programs in multiple data processing systems. Its purpose is to be used by implementers and programmers.] It specifies: -- C language representation; -- C languag

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;The following are allowed:1= i;］3. The combination of the operator and the operand is specified by the syntax. [Note: The syntax specifies the precedence of an operator in an expression calculation, which is the same as the order of the main sub-clauses of the clause, and the highest priority is first introduced. Thus, for example, an expression that is allowed as a binocular operator + (6.5.6) is the expression defined in 6.5.1 to 6.5.6. The excepti

result cannot be a negative number, The operands of this comparison may never be compared to equal. Thus, for full portability, the variable C should be declared as int.5, Example 2 in the following program fragment:Char C; int i; Long = (c =i);The value of I is converted to the type of the assignment expression c = i , which is the char type. The value of the expression enclosed in parentheses is then converted to the type of the outer assignment expression, that is, the long int type.6, exam

6.10.1 conditions includeConstraints1, the control condition contains the expression should be an integer constant expression, in addition to: identifiers (including those that are lexical and the same as the keyword) are resolved to the following description; [Note: Because the control constant expression is computed during phase 4 of the translation period, all identifiers are either macro names or macro names-- They are not keywords, enumeration constants, and so on. ] and it can contain a si