c文档中心

1、http://snippets.dzone.com/tag/c/ --数以千计的有用的C语言源代码片段
2、http://www.hotscripts.com/category/c-cpp/scripts-programs/ Hotscripts --提供数以百计的C和C++脚本和程序。所有程序都分为不同的类别。
3、http://www.planetsourcecode.com/vb/default.asp?lngWId=3 --超过万行C和C++免费的源代码
4、http://freshmeat.net/browse/164/ --超过9000个C编写的项目。
5、http://www.daniweb.com/code/c.html --DANIWEB提供的实用代码段。
6、http://www.programmersheaven.com/tags/C/ --programmersheaven.com上的C编程资源。
7、http://www.ddj.com/code/ddj.html --Dr. Dobb’s Journal的源代码。
8、http://www.cprogramming.com/cgi-bin/source/source.cgi --C和C + +编程资源。
9、http://www.codecogs.com/ --CodeCogs是一项协作的开放源码库，C/C++的数值方面的组件。
10、http://www.google.com/codesearch?q=programming++lang:c&cs_r=lang:c --谷歌代码的C源代码。
11、http://www.codepedia.com/1/C --CodePedia是一个开放的关于系统编程和其他与电脑有关的议题。
12、http://www.cis.temple.edu/~ingargio/cis71/c ......

好久以前做的一个程序，贪心策略实现背包问题，c实现。
总结在这里，以备以后和别人查找。
//背包问题
#include "stdio.h"
#define MAX 10
void main()
{
int w[MAX]={0,10,130,15,60,25};      //存放质量
int v[MAX]={0,30,5,10,20,25};   //存放价值
float a[MAX]={0};  //存放取的量，即输出结果。
int m,n,i,max;
m=100;n=5;
/*

    scanf("%d %d",&m,&n);
     for(i=1;i<=n;i++)
      scanf("%d",&w[i]);    //重量和价值都从1号开始存，零号（=0）空下，一会做max
     for(i=1;i<=n;i++)
      scanf("%d",&v[i]);*/

for(i=1;i<=n;i++)
  printf("%d: %d    ",w[i],v[i]);
do{
  max=0;
  for(i=1;i<=n;i++)
   if(v[i]>v[max])
   ......

http://en.wikipedia.org/wiki/C_preprocessor
C preprocessor
from Wikipedia, the free encyclopedia
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The C preprocessor (cpp) is the preprocessor for the C programming language. In many C implementations, it is a separate program invoked by the compiler as the first part of translation. The preprocessor handles directives for source file inclusion (#include), macro definitions (#define), and conditional inclusion (#if). The language of preprocessor directives is agnostic to the grammar of C, so the C preprocessor can also be used independently to process other types of files.
The transformations it makes on its input form the first four of C's so-called Phases of Translation. Though an implementation may choose to perform some or all phases simultaneously, it must behave as if it performed them one-by-one in order.
Contents
[hide]
1 Phases
2 Including files
3 Conditional compilation
4 Macro definition and expansion
4.1 Standard predefined positio ......

#include<stdio.h>
#define N 8
void input(int n,int p[N][N])
{
int i,j;
for(i=0;i<n;i++)
{
printf("please input the %d line:\n",i+1);
for(j=0;j<n;j++)
{
scanf("%d",&p[i][j]);
}
}
}
void output(int n,int p[N][N])
{
int i,j;
for(i=0;i<n;i++)
{
printf("\n");
for(j=0;j<n;j++)
{
printf("%d",p[i][j]);
}
}
}
void MATRIX_ADD(int n,int X[][N],int Y[][N],int Z[][N])
{
int i,j;
for(i=0;i<n;i++)
for(j=0;j<n;j++)
Z[i][j]=X[i][j]+Y[i][j];
}
void MATRIX_SUB(int n,int X[][N],int Y[][N],int Z[][N])
{
int i,j;
for(i=0;i<n;i++)
for(j=0;j<n;j++)
Z[i][j]=X[i][j]-Y[i][j];
}
void MATRIX_MULTIPLY(int A[][N],int B[][N],int C[][N])
{
int i,j,t;
for(i=0;i<2;i++)
for(j=0;j<2;j++)
{
C[i][j]=0;
for(t=0;t<2;t++)
C[i][j]=C[i][ ......

例) 危険なコーディング
1                char cStr[256];
2                ZeroMemory(cStr, sizeof(cStr));
3                strcpy(cStr, src); ← srcのサイズが256バイトを超えていた場合オーバーフロー！

修正)
1                char cStr[256];
2                ZeroMemory(cStr,0, sizeof(cStr));
3                strncpy(cStr, src, sizeof(cStr)-1);

危険な関数
代替関数
gets
fgets
strcat
strncat
strcpy
strncpy
sprintf
snprintf
vsprintf
vsnprintf

危険な例)
#in ......

C/C++ Reference
http://www.cppreference.com/
C++ Library Reference
http://www.cplusplus.com/ref/
Standard C++ Library Class Reference at Rogue Wave
http://www.roguewave.com/support/docs/hppdocs/stdref/
Dinkum C++ Library Reference Manual.
http://www.dinkumware.com/refxcpp.html
------------------------------------------------------------------
More About STL:
http://www.cs.rpi.edu/~musser/stl-book/ Effective STL
http://www.bdsoft.com/resources/estlcode.html Effective STL -Example S
ource Code
http://www.bdsoft.com/resources.html
http://www.bdsoft.com/tools/stlfilt.html STLFilt( free) An STL Error M
essage Decryptor for C++
http://www.oonumerics.org/blitz/download/ Bitz library
http://www.cs.auc.dk/%7E ......

(转）学习c/c++的50个好网站

(转）学习c/c++的50个好网站

用c实现背包问题（贪心）

C preprocessor

strassen in c language.

C rule

【链接】C/C++ Online Reference

【链接】C/C++ Online Reference