Conversion of int, float, double, and string in C ++ 11, floatdouble

Conversion of int, float, double, and string in C ++ 11, floatdouble

In C ++ 11, you can use the std: to_string () function to convert the value to the string format, which is very convenient.

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Std: to_string

string to_string (int val);string to_string (long val);string to_string (long long val);string to_string (unsigned val);string to_string (unsigned long val);string to_string (unsigned long long val);string to_string (float val);string to_string (double val);string to_string (long double val);

Convert numerical value to string

Returns a string with the representationVal.

Example

 1 // to_string example 2 #include <iostream>   // std::cout 3 #include <string>     // std::string, std::to_string 4  5 int main () 6 { 7   std::string pi = "pi is " + std::to_string(3.1415926); 8   std::string perfect = std::to_string(1+2+4+7+14) + " is a perfect number"; 9   std::cout << pi << '\n';10   std::cout << perfect << '\n';11   return 0;12 }

Output

Pi is 3.141593

28 is a perfect numbe

References

[1]Http://www.cplusplus.com/reference/string/to_string/