constant expression

one-dimensional arraysElements in a one-dimensional array are arranged in one line, and a single-dimensional array is often used when a row or column of data needs to be stored. The elements of a one-dimensional array are commonly used as "array

Standard conversionsThe C + + language defines conversions between its underlying types. It also defines pointers, references, and conversions to pointer-derived types of members. These conversions are called "standard conversions."1. Integral type

　one-dimensional arrays : int a[c], where a is an array name, C is an array dimension, and the array dimension must be a constant expression! For example:1 int c=3; 2 int a[c];//Error! Because C is not a constant expression, the definition is

Topic 1: Using arrays to process data in batches  1. Arrays and loops are combined  2. The definition of an array  2.1) one-dimensional array: The type character array name [constant expression] 2.2] is defined to inform the computer to divide the

There are three kinds of program structure in C language, namely sequential structure, selection structure and cyclic structure.The program structure, which is executed according to the order of the statements, is called the sequential structure.The

First, the PTA laboratory work Title 1. Find the specified number in the struct array 1. PTA Submission List2. Design Ideasstruct student{ char num[10]; int year,month,day ;};//该结构体表示人员的编号，出生年、月、日 定义i为循环变量,定义结构变量p for i=0 to N-1

The 6th chapter: The semantic study in the implementation period Imagine that we have the following simple formula: if (yy ==xx.getvalue ()) ... where xx and yy are defined as: X xx; Y yy; Class y is defined as: Class y{ Public: Y (); ~y (); Bool

To determine if switch ternary expression loop while doing while for break and continue Judge Judgment, hence the name of righteousness, is to judge the conditions, meet the conditions (true) what to do, does not satisfy (false) what to do.

Remember: normally static data members are declared in the class declaration and initialized in the file containing the class method. Use the scope operator to indicate the class to which the static member belongs when initializing. However, if the

One, if statement Statement form: if (expression) { Statements executed by } The statements in {} are executed only if the value of the expression is true or not 0 o'clock; If-else is a pair, but sometimes there is only if and there is no

The checked and unchecked operators control overflow checking in the current environment when used in integer arithmetic operations. The following operations participate in the checked and unchecked checks (operands are all integers): 1 The

mysql| optimization where optimization is mainly in select, because they are used most mainly in there, but the same optimizations can also be used for delete and UPDATE statements. However, please note that the following optimizations are not

 variables and basic typesVii. EnumerationEnumerations define not only the set of integer constants, but also the aggregation of them into groups; The enumeration is inferior to a simple const constant, which is known by the following piece of

C Language # define keywords, Conditional compilation and predefined symbolic knowledge details,I. pre-defined symbols The C standard defines the following five preprocessing symbols _ FILE _ // name of the source FILE to be compiled _ LINE

2015.1.22Single branch structureif (conditional expression)//{Execute the statement;//}/*int Main (int argc, const char * argv[]) {int score;scanf ("%d", &score);Error correction processingif (score100) {return-1;}if (score >=90){printf ("Excellent \

This is a creation in Article, where the information may have evolved or changed. [] (https://raw.githubusercontent.com/studygolang/gctt-images/master/composite-literal/1_ Tm61vtlvvl2ywti6uuylog.png) literals in the source code can describe fixed

switch (expression){case constant Expression 1: statement 1;break;Case constant Expression 2: statement 2;break;......case constant Expression N: statement n;break;Default: Statement n+1;break;}for (expression; expression 2; expression 3)loop body

One. Select structure:1. If selection structure2. IF-ELSE selection Structure3. If-else If-else if-else Multiple if selection structure4. If-if-else-else Nested IF selection structure5. Switch selection structureswitch (expression){case constant

One. Select structure:1. If selection structure2. IF-ELSE selection Structure3. If-else If-else if-else Multiple if selection structure4. If-if-else-else Nested IF selection structure5. Switch selection structureswitch (expression){case constant

1 Array   In the process of program design, we often need to process a batch of data of the same type. It is obviously inconvenient to use basic type definition variables for storage. This is what we need to use arrays.   2 array features   1. the