CODEWITHSUNDEEP
c++visual-c++floating-point
user1115652
user1115652

Reputation:

How to output a float neither in scientific, nor in fixed point notation in std::cout?

#include <iostream>

int main()
{
    float test = 12535104400;

    std::cout << test;

    std::cin.get();
    return 0;
}

//on msvc 2010 this ouputs:  1.25351e+010

I would like it to output just "12535104400" or in other words, the human readable format which has no leading zeros, but outputs the full value of a number.

Upvotes: 2

Views: 1163

Answers (6)

Armen Tsirunyan
Armen Tsirunyan

Reputation: 133122

float test = 12535104400;

This should be a compiler error if your compiler doesn't support long long and int is 32-bit. Use floating literals instead of integer literals e.g 1234.0f vs 1234

#include <iostream>
#include <iomanip>
int main()
{
    float test = 12535104400.0f;

    std::cout << std::setiosflags(ios::fixed) << std::setprecision(0) << test;

    std::cin.get();
    return 0;
}

should print what you want. But beware that float isn't that precise

Upvotes: 3

Maxpm
Maxpm

Reputation: 25642

If you're willing to lose precision, you can typecast it to an integer.

cout << int(test);

or

cout << (int)test;

Upvotes: 0

Nim
Nim

Reputation: 33655

The particular number cannot be accurately represented, for example try the following:

  float v = 12535104400;
  cout.precision(0);
  cout << fixed << v << endl;

You'll see it outputs: 12535104512

Upvotes: 5

Drakosha
Drakosha

Reputation: 12165

In order to format the output in iostream, you'll need manipulators

Upvotes: 0

icecrime
icecrime

Reputation: 76835

You will need to include <iomanip> :

int main()
{
    const double test = 12535104400;

    std::cout << std::fixed << std::setprecision(0) << test;

    std::cin.get();
    return 0;
}
  • std::fixed is the manipulator which uses fixed-point precision (not scientific notation)
  • std::setprecision(0) sets how many digits to display after the decimal point

Upvotes: 5

Kugel
Kugel

Reputation: 19864

You are out of luck, 4-byte float can store cca 7 digits. Use double or long for such numbers.

Upvotes: 1

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