Printing the correct number of decimal points with cout

Question

I have a list of float values and I want to print them with cout with 2 decimal places   For example   10 900  should be printed as 10 90 1 000 should be printed as 1 00 122 345 should be printed as 122 34   How can I do this      setprecision doesn t seem to help in this

User · Answer

Simplify the accepted answer

Simplified example:

#include <iostream>
#include <iomanip>

int main()
{
    double d = 122.345;
    std::cout << std::fixed << std::setprecision(2) << d;
}

And you will get output

122.34

Reference:

User · Answer

You were nearly there  need to use std  fixed as well  refer http   www cplusplus com reference iostream manipulators fixed    include  lt iostream gt   include  lt iomanip gt   int main int argc  char   argv        float testme       0 12345  1 2345  12 345  123 45  1234 5  12345         std  cout  lt  lt  std  setprecision 2   lt  lt  std  fixed       for int i   0  i  lt  6    i                std  cout  lt  lt  testme i   lt  lt  std  endl             return 0      outputs   0 12 1 23 12 35 123 45 1234 50 12345 00

User · Answer

To set fixed 2 digits after the decimal point use these first   cout setf ios  fixed   cout setf ios  showpoint   cout precision 2     Then print your double values   This is an example    include  lt iostream gt  using std  cout  using std  ios  using std  endl   int main int argc  char  argv          cout setf ios  fixed       cout setf ios  showpoint       cout precision 2       double d   10 90      cout  lt  lt  d  lt  lt  endl      return 0

User · Answer

include lt stdio h gt  int main        double d 15 6464545347   printf   0 2lf  d

User · Answer

I had this similar problem in a coding competition and this is how I handled it  Setting a precision of 2 to all double values  First adding the header to use setprecision   include  lt iomanip gt   Then adding the following code in our main    double answer 5 9999    double answer2 5 0000    cout lt  lt setprecision 2  lt  lt fixed    cout  lt  lt answer  lt  lt  endl    cout  lt  lt answer2  lt  lt  endl    Output   5 99 5 00   You need to use fixed for writing 5 00 thats why your output won t come for 5 00   A short reference video link I m adding which is helpful

User · Answer

Just a minor point  put the following in the header  using namespace std   then  std  cout  lt  lt  std  fixed  lt  lt  std  setprecision 2   lt  lt  d   becomes simplified to  cout  lt  lt  fixed  lt  lt  setprecision 2   lt  lt  d

User · Answer

With  lt iomanip gt   you can use std  fixed and std  setprecision  Here is an example   include  lt iostream gt   include  lt iomanip gt   int main         double d   122 345       std  cout  lt  lt  std  fixed      std  cout  lt  lt  std  setprecision 2       std  cout  lt  lt  d      And you will get output   122 34

User · Answer

this an example using a matrix   cout lt  lt setprecision 4  lt  lt fixed lt  lt m i  j

User · Answer

I had an issue for integers while wanting consistent formatting  A rewrite for completeness   include  lt iostream gt   include  lt iomanip gt  using namespace std   int main               floating point formatting example     cout  lt  lt  fixed  lt  lt  setprecision 2   lt  lt  122 345  lt  lt  endl            Output   122 34            integer formatting example     cout  lt  lt  fixed  lt  lt  setprecision 2   lt  lt  double 122   lt  lt  endl            Output   122 00

User · Answer

setprecision n  applies to the entire number  not the fractional part   You need to use the fixed-point format to make it apply to the fractional part  setiosflags ios  fixed

User · Answer

with templates   include  lt iostream gt      d   decimal places template lt int d gt   std  ostream amp  fixed std  ostream amp  os       os setf std  ios base  fixed  std  ios base  floatfield        os precision d        return os      int main        double d   122 345      std  cout  lt  lt  fixed lt 2 gt   lt  lt  d      similar for scientific as well  with a width option also  useful for columns      d   decimal places template lt int d gt   std  ostream amp  f std  ostream  amp os       os setf std  ios base  fixed  std  ios base  floatfield        os precision d        return os         w   width  d   decimal places template lt int w  int d gt   std  ostream amp  f std  ostream  amp os       os setf std  ios base  fixed  std  ios base  floatfield        os precision d        os width w       return os         d   decimal places template lt int d gt   std  ostream amp  e std  ostream  amp os       os setf std  ios base  scientific  std  ios base  floatfield        os precision d        return os         w   width  d   decimal places template lt int w  int d gt   std  ostream amp  e std  ostream  amp os       os setf std  ios base  scientific  std  ios base  floatfield        os precision d        os width w       return os      int main        double d   122 345      std  cout  lt  lt  f lt 10 2 gt   lt  lt  d  lt  lt    n           lt  lt  e lt 10 2 gt   lt  lt  d  lt  lt    n

User · Answer

You have to set the  float mode  to fixed   float num   15 839      this will output 15 84 std  cout  lt  lt  std  fixed  lt  lt   num      lt  lt  std  setprecision 2   lt  lt  num  lt  lt  std  endl

[c++] Printing the correct number of decimal points with cout

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