print double with precision 4 using cout

Question

Possible Duplicate:
Convert a double to fixed decimal point in C++

Suppose , I have double a = 0 and I want to print it as 0.0000 .

I've tried this :

cout.precision(4) ; 
cout<<a<<endl ;

but it gaves 0 as the output.

The duplicate doesn't provide a direct answer to the question, the accepted answer does. — Passer By, Nov 21 '17 at 17:18

score 29 · Accepted Answer · answered Dec 05 '12 at 17:00

29

Just try:

#include <iomanip>
...
cout << fixed << setprecision(4);
cout << a << endl;

See here.

answered Dec 05 '12 at 17:00

semekh

3,867
2
24
34

score 1 · Answer 2 · answered Dec 05 '12 at 18:01

1

#include <iomanip>
#include <iostream.h>


int main()
{
double a = 0.00;
// print a double, 2 places of precision 
cout << setprecision(4) << a << endl;
}

answered Dec 05 '12 at 18:01

crh225

821
18
34

1

Apart from missing `std::`s and non existent `iostream.h`, without `std::fixed` this simply doesn't work. – Avio Aug 14 '14 at 10:16
@Avio It works well with visual studio – crh225 Aug 14 '14 at 15:43
@crh225 This shouldn't work and is not language consistent. – ABCD Oct 22 '17 at 06:05

print double with precision 4 using cout

2 Answers2

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