I am trying to convert a string decimal number into a double, however when I use the atof() function, my number ends up rounding to the whole number.
#include<iostream>
#include<cstdlib>
using namespace std;
int main()
{
string num = "135427.7000";
double r = atof(num.c_str());
cout << r << endl;
}
The output is:
135428
I want:
135427.7
cout does that, not atof().
More precisely, operator<<, which inserts the formated data into the std::ostream.
You can use std::setprecision() from the <iomanip> standard library to print the decimals:
cout << setprecision(7) << r << endl;
or
cout << fixed << setprecision(1) << r << endl;
If you want to print the whole 135427.7000:
cout << fixed << setprecision(4) << r << endl;