string和int float等之间的转换

c语言中:

string 转 int,float

c语言中准确的说应该是char*类型转换成int和float等类型.

头文件: <stdlib.h> 对于c++可以用<cstdlib>

atoi 转int

atof 转float

strtod 转double

strtol转long

strtoul转unsigned long

反过来 int/float向char *的转换:

int,float to string

itoa from int

ltoa from long

ultoa from unsigned long

ftoa from float

sprintf函数方法实现;

sprintf( mystring, "%d", myint );sprintf( mystring, "%f", myfloat );

c++中:

string to int, float

int,float to string

借道stringstream可以用于各种类型之间的数据转换.

即将int读入到stringstream对象中,然后stringstream对象读出到string对象中即可.反过来也可以.

#include <sstream>stringstream sstrm;string str("123");int i;sstrm<<str;sstrm>>i;