CODEWITHSUNDEEP
c++printf
ztik
ztik

Reputation: 3612

Control exponent digits of a float using printf in gcc

I am using mingw-gcc and I want to print a float.

#include <cstdio>
#include <iostream>

int main(){
  float a =1.23;
  std::cout << std::scientific << a << std::endl;
  printf("%e\n",a);
  return 0;
}

the output is

1.230000e+000
1.230000e+000

However float does not need more than two digits. Is there any way in gcc to export number with 2 digit exponent?

1.230000e+00
1.230000e+00

Is there any similar function like _set_output_format of Visual studio?

Upvotes: 0

Views: 468

Answers (1)

ewcz
ewcz

Reputation: 13087

at least as far as printf is concerned, it seems that one can set the environment variable PRINTF_EXPONENT_DIGITS to 2 and compile with -posix switch (tested with mingw g++ 5.3.0 on clean install of Windows 10)

Upvotes: 2

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