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How do I read an entire file into a std::string in C++?
How do I read a file into a std::string , i.e., read the whole file at once?
15 Answers
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What is the optimal length for an email address in a database?
...s though.
Again, since a varchar only uses the space actually used by the string you store, there is no reason to have a small limit for email address length. Just go with 512 and stop worrying. Everything else is premature optimization
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How to increment a pointer address and pointer's value?
...str)
{
cout<<*str<<endl; // printing the string
*str++; // incrementing the address(pointer)
// check above about the prcedence and associativity
}
free(str[0]);
free(str[1]);
fr...
How to use GROUP BY to concatenate strings in SQL Server?
...
A slightly cleaner way of doing the string manipulation: STUFF((SELECT ', ' + [Name] + ':' + CAST([Value] AS VARCHAR(MAX)) FROM #YourTable WHERE (ID = Results.ID) FOR XML PATH ('')),1,2,'') AS NameValues
– Jonathan Sayce
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Capitalize first letter. MySQL
...= CONCAT(UCASE(LEFT(CompanyIndustry, 1)),
SUBSTRING(CompanyIndustry, 2));
This would turn hello to Hello, wOrLd to WOrLd, BLABLA to BLABLA, etc. If you want to upper-case the first letter and lower-case the other, you just have to use LCASE function :
UPDATE tb_Compa...
Write to .txt file?
...
FILE *fp;
char* str = "string";
int x = 10;
fp=fopen("test.txt", "w");
if(fp == NULL)
exit(-1);
fprintf(fp, "This is a string which is written to a file\n");
fprintf(fp, "The string has %d words and keyword %s\n", x, str);
fclose(fp);
...
Test whether string is a valid integer
...aining it so I can learn a little? I gather it reads, "At the start of the string (^), a minus sign (-) is optional (?), followed by any number of characters between zero and 9, inclusive" ... and what then might the +$ mean? Thanks.
– Richard T
Feb 5 '10 at 21...
C++11 tuple 这一篇就够了 - C/C++ - 清泛网 - 专注C/C++及内核技术
...的多个tuple）。
#include <iostream>
#include <utility>
#include <string>
#include <tuple>
int main ()
{
std::tuple<float,std::string> mytuple (3.14,"pi");
std::pair<int,char> mypair (10,'a');
auto myauto = std::tuple_cat ( mytuple, mypair );
std::cout << "myauto contai...
std::stringstream ss; 直接使用ss.str().c_str() 字符串指针可能导致崩溃 ...
std::stringstream ss; 直接使用ss.str().c_str() 字符串指针可能导致崩溃std::stringstream ss;const char* ch = ss str() c_str();call_func(ch);这种写法在系统内存不足时，ss会立马释放内存，字符串指针ch可能会非法访问导致崩溃。代码最好的是
std::s...
VC/Linux C++ 递归访问目录下所有文件 - c++1y / stl - 清泛IT社区，为创新赋能！
...ent.h>
#include <iostream>
#include <cstdlib>
#include <cstring>
using namespace std;
void GetFileInDir(string dirName)
{
DIR* Dir = NULL;
struct dirent* file = NULL;
if (dirName[dirName.size()-1] != '/')
{
&nb...