How to in C / C ++How to convert a string to double precision in

This is an example of converting a string to double.

Example

#include <iostream>
using namespace std;
int main() {
　　　char s[20] = "18.2894　is a number";
　　　char　*p;
　　　double result;
　　　result = strtod(s, &p);
　　　cout << "The number after conversion of string: " << result;
　　　return(0);
}

Output result

The number after conversion of string:　18.289400

In the above program, a char type array s [20]. This functionstrtod()used to convert the string to a double.

char s[20] = "18.2894　is a number";
char　*p;
double result;
result = strtod(s, &p);