求解释代码---

fcly1981826ly 2011-04-13 10:24:11
int sum=0, val=1;

while(val<=10){
sum+=val;
++val;
}

--------------------------

这个是C++ primer 第四版第十页的列子，小弟弟不明白求前辈指导。谢谢。
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maoyin123456789 2011-04-27
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建议你果断的别看C++ primer了，这书还是要一定基础了，去找一点基础点书看看
vitah 2011-04-27
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建议好好看看书，
toadzw 2011-04-27
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这类基本问题建议LZ看看书
zywuhan6328219 2011-04-24
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基础要好，不然会很痛苦的。。。
o(︶︿︶)o
我也愚钝，开窍也是慢半拍，，现在好多了，原来真是摧残人啊！
zywuhan6328219 2011-04-24
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楼主需速度补专业知识！！
cumt_TTR 2011-04-23
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楼主缺乏编程基础啊，这是个很简单的循环，在大学里普通的理工课学生也能看明白啊
fcly1981826ly 2011-04-22
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我愚钝。。。。。。。。。。。。。。。。唉。。。。。。。。。。。。。。。
fcly1981826ly 2011-04-14
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什么不明白的，这就是从1加到10啊？

------------


我 现在是说不清楚我具体什么地方不明白，，，郁闷，，，，，
TallPeaks 2011-04-14
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楼主可以单步跟踪试试。新手就这样，不用慌，都是从新手走出来的。
luciferisnotsatan 2011-04-14
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循环累加
如果这都看不明白，把书找出来好好看看
ww884203 2011-04-14
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什么不明白的，这就是从1加到10啊？
fcly1981826ly 2011-04-14
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引用 12 楼 fcly1981826ly 的回复:


我慢慢理解，谢谢你们。。


楼主，强烈建议你找本C语言基础方面的书，看看“循环”方面的内容，一般也就是5页书左右。

-------------


看哪本书，，
pathuang68 2011-04-13
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[Quote=引用 12 楼 fcly1981826ly 的回复:]

我慢慢理解，谢谢你们。。
[/Quote]

楼主，强烈建议你找本C语言基础方面的书，看看“循环”方面的内容，一般也就是5页书左右。
helong0904 2011-04-13
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来晚了，想说的都被他们说了
fcly1981826ly 2011-04-13
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我慢慢理解，谢谢你们。。
赵4老师 2011-04-13
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单步调试和设断点调试是程序员必须掌握的技能之一。
antspower 2011-04-13
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开始时定义了sum=0,val=1。while后的括号内是判断语句，首先把val=1代入（）内，满足条件时执行大括号内的语句，val自增后再返回到（）内判断，到val>10时退出。
antspower 2011-04-13
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开始时定义了sum=0,val=1。while后的括号内是判断语句，首先把val=1代入（）内，满足条件时执行大括号内的语句，val自增后再返回到（）内判断，到val>10时退出。
shaotine_wu 2011-04-13
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[Quote=引用 4 楼 fcly1981826ly 的回复:]

谢谢楼上两位，


while(val<=10){
sum+=val;
++val;
}

-------------------

这整段代码是怎么加的呢?加10次具体怎么加的？
[/Quote]
用while循环加，实现从1加到10
孙歌 2011-04-13
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求1+2+3+4+ ... +10的和：
int sum=0, val=1;//当val<=10就循环
while(val<=10){
sum+=val;//sum = sum+val
++val;//val=val+1
}
加载更多回复（6）
The C Programming Language 第二版 英文版
The C programming Language 第二版英文版 內容列表 Table of Contents Preface.......................................................... Preface to the first edition..................................... Introduction..................................................... Chapter 1 - A Tutorial Introduction.............................. 1.1 Getting Started................................ 1.2 Variables and Arithmetic Expressions........... 1.3 The for statement.............................. 1.4 Symbolic Constants............................. 1.5 Character Input and Output..................... 1.5.1 File Copying.......................... 1.5.2 Character Counting.................... 1.5.3 Line Counting......................... 1.5.4 Word Counting......................... 1.6 Arrays......................................... 1.7 Functions...................................... 1.8 Arguments - Call by Value...................... 1.9 Character Arrays............................... 1.10 External Variables and Scope.................. Chapter 2 - Types, Operators and Expressions..................... 2.1 Variable Names................................. 2.2 Data Types and Sizes........................... 2.3 Constants...................................... 2.4 Declarations................................... 2.5 Arithmetic Operators........................... 2.6 Relational and Logical Operators............... 2.7 Type Conversions............................... 2.8 Increment and Decrement Operators.............. 2.9 Bitwise Operators.............................. 2.10 Assignment Operators and Expressions.......... 2.11 Conditional Expressions....................... 2.12 Precedence and Order of Evaluation............ Chapter 3 - Control Flow......................................... 3.1 Statements and Blocks.......................... 3.2 If-Else........................................ 3.3 Else-If........................................ 3.4 Switch......................................... 3.5 Loops - While and For.......................... 3.6 Loops - Do-While............................... 3.7 Break and Continue............................. 3.8 Goto and labels................................ Chapter 4 - Functions and Program Structure...................... 4.1 Basics of Functions............................ 4.2 Functions Returning Non-integers............... 4.3 External Variables............................. 4.4 Scope Rules.................................... 4.5 Header Files................................... 4.6 Static Variables................................ 4.7 Register Variables.............................. 4.8 Block Structure................................. 4.9 Initialization.................................. 4.10 Recursion...................................... 4.11 The C Preprocessor............................. 4.11.1 File Inclusion........................ 4.11.2 Macro Substitution.................... 4.11.3 Conditional Inclusion................. Chapter 5 - Pointers and Arrays.................................. 5.1 Pointers and Addresses......................... 5.2 Pointers and Function Arguments................ 5.3 Pointers and Arrays............................ 5.4 Address Arithmetic............................. 5.5 Character Pointers and Functions............... 5.6 Pointer Arrays; Pointers to Pointers........... 5.7 Multi-dimensional Arrays....................... 5.8 Initialization of Pointer Arrays............... 5.9 Pointers vs. Multi-dimensional Arrays.......... 5.10 Command-line Arguments........................ 5.11 Pointers to Functions......................... 5.12 Complicated Declarations...................... Chapter 6 - Structures........................................... 6.1 Basics of Structures........................... 6.2 Structures and Functions....................... 6.3 Arrays of Structures........................... 6.4 Pointers to Structures......................... 6.5 Self-referential Structures.................... 6.6 Table Lookup................................... 6.7 Typedef........................................ 6.8 Unions......................................... 6.9 Bit-fields..................................... Chapter 7 - Input and Output..................................... 7.1 Standard Input and Output....................... 7.2 Formatted Output - printf....................... 7.3 Variable-length Argument Lists.................. 7.4 Formatted Input - Scanf......................... 7.5 File Access..................................... 7.6 Error Handling - Stderr and Exit................ 7.7 Line Input and Output........................... 7.8 Miscellaneous Functions......................... 7.8.1 String Operations...................... 7.8.2 Character Class Testing and Conversion. 7.8.3 Ungetc................................. 7.8.4 Command Execution...................... 7.8.5 Storage Management..................... 7.8.6 Mathematical Functions................. 7.8.7 Random Number generation............... Chapter 8 - The UNIX System Interface............................ 8.1 File Descriptors............................... 8.2 Low Level I/O - Read and Write................. 8.3 Open, Creat, Close, Unlink..................... 8.4 Random Access - Lseek.......................... 8.5 Example - An implementation of Fopen and Getc.. 8.6 Example - Listing Directories.................. 8.7 Example - A Storage Allocator.................. Appendix A - Reference Manual.................................... A.1 Introduction................................... A.2 Lexical Conventions............................ A.2.1 Tokens................................ A.2.2 Comments.............................. A.2.3 Identifiers........................... A.2.4 Keywords.............................. A.2.5 Constants............................. A.2.6 String Literals....................... A.3 Syntax Notation................................ A.4 Meaning of Identifiers......................... A.4.1 Storage Class......................... A.4.2 Basic Types........................... A.4.3 Derived types......................... A.4.4 Type Qualifiers....................... A.5 Objects and Lvalues............................ A.6 Conversions.................................... A.6.1 Integral Promotion.................... A.6.2 Integral Conversions.................. A.6.3 Integer and Floating.................. A.6.4 Floating Types........................ A.6.5 Arithmetic Conversions................ A.6.6 Pointers and Integers................. A.6.7 Void.................................. A.6.8 Pointers to Void...................... A.7 Expressions.................................... A.7.1 Pointer Conversion.................... A.7.2 Primary Expressions................... A.7.3 Postfix Expressions................... A.7.4 Unary Operators....................... A.7.5 Casts................................. A.7.6 Multiplicative Operators.............. A.7.7 Additive Operators.................... A.7.8 Shift Operators....................... A.7.9 Relational Operators.................. A.7.10 Equality Operators................... A.7.11 Bitwise AND Operator................. A.7.12 Bitwise Exclusive OR Operator........ A.7.13 Bitwise Inclusive OR Operator........ A.7.14 Logical AND Operator................. A.7.15 Logical OR Operator.................. A.7.16 Conditional Operator................. A.7.17 Assignment Expressions............... A.7.18 Comma Operator.......................... A.7.19 Constant Expressions.................... A.8 Declarations..................................... A.8.1 Storage Class Specifiers................. A.8.2 Type Specifiers.......................... A.8.3 Structure and Union Declarations......... A.8.4 Enumerations............................. A.8.5 Declarators.............................. A.8.6 Meaning of Declarators................... A.8.7 Initialization........................... A.8.8 Type names............................... A.8.9 Typedef.................................. A.8.10 Type Equivalence........................ A.9 Statements....................................... A.9.1 Labeled Statements....................... A.9.2 Expression Statement..................... A.9.3 Compound Statement....................... A.9.4 Selection Statements..................... A.9.5 Iteration Statements..................... A.9.6 Jump statements.......................... A.10 External Declarations........................... A.10.1 Function Definitions.................... A.10.2 External Declarations................... A.11 Scope and Linkage............................... A.11.1 Lexical Scope........................... A.11.2 Linkage................................. A.12 Preprocessing................................... A.12.1 Trigraph Sequences...................... A.12.2 Line Splicing........................... A.12.3 Macro Definition and Expansion.......... A.12.4 File Inclusion.......................... A.12.5 Conditional Compilation................. A.12.6 Line Control............................ A.12.7 Error Generation........................ A.12.8 Pragmas................................. A.12.9 Null directive.......................... A.12.10 Predefined names....................... A.13 Grammar......................................... Appendix B - Standard Library.................................... B.1.1 File Operations................................ B.1.2 Formatted Output......................... B.1.3 Formatted Input.......................... B.1.4 Character Input and Output Functions..... B.1.5 Direct Input and Output Functions........ B.1.6 File Positioning Functions............... B.1.7 Error Functions.......................... B.2 Character Class Tests: ................. B.3 String Functions: ..................... B.4 Mathematical Functions: ................. B.5 Utility Functions: ....................
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