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scanf() leaves the new line char in the buffer

...ing whitespace automatically before trying to parse conversions other than characters. The character formats (primarily %c; also scan sets %[…] — and %n) are the exception; they don't skip whitespace. Use " %c" with a leading blank to skip optional white space. Do not use a trailing blank in ...
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Finding all possible permutations of a given string in python

...nt to generate all permutations from that string, by changing the order of characters in it. For example, say: 24 Answers ...
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各编程语言读写文件汇总 - C/C++ - 清泛网 - 专注C/C++及内核技术

...puts简单读写,一般用于处理文本文件。 int main(int argc, char* argv[]) { FILE *fp = NULL; /*打开文件*/ if((fp = fopen("test.txt", "w+")) == NULL) { printf("文件打开出错,请检查文件是否存在!\n"); return -1; } else { printf("文件已经...
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When is CRC more appropriate to use than MD5/SHA1?

... inappropriate CRC hashes are for hash tables. It also explains the actual characteristics of the algorithm. The study also includes evaluation of other hash algorithms and is a good reference to keep. The relevant conclusion on CRC for hashes: CRC32 was never intended for hash table use. There...
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lua和c/c++互相调用实例分析 - C/C++ - 清泛网 - 专注C/C++及内核技术

...te(void) ; //加载lua脚本文件 int luaL_loadfile(lua_State *L, const char *filename); lua和c/c++的数据交互通过"栈"进行 ,操作数据时,首先将数据拷贝到"栈"上,然后获取数据,栈中的每个数据通过索引值进行定位,索引值为正时表示相对于...
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std::string length() and size() member functions

....) and length() is to be consistent with most peoples' intuitive notion of character strings. People usually talk about a word, sentence or paragraph's length, not its size, so length() is there to make things more readable. ...
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Passing variable arguments to another function that accepts a variable argument list

...#include <stdio.h> template<typename... Args> void test(const char * f, Args... args) { printf(f, args...); } int main() { int a = 2; test("%s\n", "test"); test("%s %d %d %p\n", "second test", 2, a, &a); } At the very least, it works with g++. ...
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How to prevent gcc optimizing some statements in C?

...ore by using the volatile type qualifier. // Assuming pageptr is unsigned char * already... unsigned char *pageptr = ...; ((unsigned char volatile *)pageptr)[0] = pageptr[0]; The volatile type qualifier instructs the compiler to be strict about memory stores and loads. One purpose of volatile is...
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Simple example of threading in C++

... // do stuff } void task2() { // do stuff } int main (int argc, char ** argv) { using namespace boost; thread thread_1 = thread(task1); thread thread_2 = thread(task2); // do other stuff thread_2.join(); thread_1.join(); return 0; } ...
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How to create ENUM type in SQLite?

... answer. Unless the string is really short, I'm totally against it. 1 or 2 characters maximum. – MPelletier May 9 '14 at 21:34 ...