Indispensable Windows Native (3), windowsnative

Indispensable Windows Native (3), windowsnative

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Indispensable Windows Native (3)-C language: operators, expressions, conditional statements, cyclic statements, steering statements, empty statements, etc.

Author: webabcd


Introduction
Indispensable C language for Windows Native

• Operator
• Expression
• Condition Statement
• Loop statement
• Turning statement
• Empty statement

Example
1. Operators
COperator. h

#ifndef _MYHEAD_OPERATOR_#define _MYHEAD_OPERATOR_ #ifdef __cplusplus  extern "C"#endif  char *demo_cOperator();#endif  

COperator. c

/** Operator */# include "pch. h "# include" cOperator. h "# include" cHelper. h "char * demo_cOperator () {// Arithmetic Operator: +,-, *,/, %, ++, -- // relational OPERATOR: >,<,=,> =, <= ,! = // Logical operator: &, | ,! // Bitwise OPERATOR: &, | ,~, ^, <,> // &-The bitwise AND: are both 1 and 1, and 0 in other cases. For example, 1001 & 0001 = 0001 // |-by-bit or: if one is 1, the value is 1. Otherwise, the value is 0. For example, if 1001 | 0001 = 1001 // ^-bitwise OR: if the difference is 1, the value is 0; for example, 1001 | 0001 = 1000 //~ -Non-bitwise :~ 1001 = 0110 // value assignment operator: =, + =,-=, * =,/=, % =, & =, |=, ^ =, >>=, <<=// condition OPERATOR: What is the three-object operator?: // Pointer OPERATOR: * used to get content & used to get the address // I ++, I itself plus 1, the value of the expression I ++ is the value before I is added 1 // ++ I, And I itself is added 1, the expression ++ I value is the int I = 0; I ++; // here the I value is 1, the value of I ++ is 0 int j = 0; ++ j; // here, the value of j is 1, the value of ++ j is 1 // sizeof-is the keyword in C, not a function, calculate the space occupied by a data type. int intSize = sizeof (short); // 2, the occupied space of int short long on different platforms may be different. You can use sizeof to know the occupied space of char * str = "abcdefghijklmnopqrstuvwxyz"; int dataSize = sizeof (str ); // 4. Here, the space occupied by the str pointer is calculated. return str_concat2 (int_toString (intSize), int_toString (dataSize ));}

2. expressions, condition statements, cyclic statements, turning statements, and empty statements
CStatement. h

#ifndef _MYHEAD_STATEMENT_#define _MYHEAD_STATEMENT_ #ifdef __cplusplus  extern "C"#endif  char *demo_cStatement();#endif  

CStatement. c

/** Expressions, condition statements, loop statements, steering statements, empty statements, etc. */# include "pch. h "# include" cStatement. h "# include" cHelper. h "char * demo_cStatement () {// the so-called expression statement is composed of the expression plus the Semicolon"; "// I ++, I itself plus 1, the value of the expression I ++ is the value before I is added 1 // ++ I, And I itself is added 1, the expression ++ I value is the value after I plus 1 // composite Statement (enclosed in braces) {int p1 = 1; int p2 = 2;} // only "; "is called the empty statement while (0) {; // This is the empty statement} // The above is equal to the following while (0 ); // The preceding statement is equal to the following while (0); // the Statement of the branch structure (if else) int a = 0, B; if (a = 1) B = 1; // Note: Variables If a is not initialized before, it cannot be compiled here. That is to say, if (a = 1) B = 2 cannot be used for unassigned variables; else if (a = 2) B = 3; else B = 4; // switch case statement (switch case) int x = 0, y; switch (x) {case 1: y = 2; break; case 2: y = 3; break; default: y = 4;} // statement of the branch structure (? :) Int m, n = 0; m = n = 1? 2: 3; // loop Statement (while) int I = 0; while (I <100) {I ++;} // loop Statement (do while) int j = 0; do {j ++;} while (j <100); // loop statement (for) for (I = 0; I <100; I ++) {} for (I = 0; I <100;) {I ++;} for (I = 0, j = 0; I <100 & j <100; I ++, j ++) {I ++; j ++;} int z = 0; for (; z <100;) {z ++ ;} // turning statement: break-Skip loop // turning statement: continue-Skip the remaining statement of the loop body and directly go to the next loop judgment // turning statement: return-exit function, and provides the return value // steering statement: goto-jump to the specified identifier and execute the subsequent statement (for example, when a multi-layer nested statement exits, it is reasonable to use goto) int result = 0; myAnchor: // custom identifier (the identifier is added with a colon) if (result = 1) {result = 100 ;} if (result = 0) {result = 1; goto myAnchor; // jump to the specified identifier (myAnchor :), and execute the following statement} return str_concat2 ("Check the code and comment", int_toString (result ));}

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