Hello everyone!!

Question

I know there's a method or smth like that in C++ that is useful when we want to output a value with a specific number of decimals. It was like" setprecizion" or something but I forgot how to use it. Can anyone help me? Thanks a lot

Answer 1

https://code.sololearn.com/cZp5uO44ZEvu/?ref=app
I edited your code @Antonia. Does this help?

Answer 2

#include <iostream>
#include <iomanip>

using namespace std;

int main ()
{
double f =3.14159;

cout << setprecision(5) << f << '\n';
cout << setprecision(9) << f << '\n';
cout << fixed;
cout << setprecision(5) << f << '\n';
cout << setprecision(9) << f << '\n';

return 0;
}

// OUTPUT
3.1416
3.14159
3.14159
3.141590000

// Methods
ios_base::precision =
Get/Set floating-point decimal precision (public member function )

fixed =
Use fixed floating-point notation (function )

Hope this helps.

Answer 3

cout << fixed << setprecision (4);
//now anything outputted after this will have
//4 decimal places

Answer 4

Yes! I Got it! Thanks a lot!!

Answer 5

Thank you!!

Answer 6

you can simple include for example as 0.9f or 0.9d where f includes the floating point number and d includes the double point numbers.
you need not set the precision over there simple in the cout that is in the output stream simply write it using the cout<<0.9f or cout<<0.9d where float takes up to 7 decimal places where double takes upto 38 decimal places

A best example is
#include<iostream>
using namespace std;
int main()
{
float f=10.235;
double d=1023.12456789;
cout<<0.2f;
cout<<"\n"<<0.9d;
return 0;
}

sorry the code is not in proper citation

Answer 7

I'm not that sure but the first ones actually if uh don't use 0.f it would result into a double point so if uh use f it takes a floating or else it is considered as default by the compiler

Answer 8

I am so sorry that was the one suitable in c language not in c++ I'm so sorry @Antonia

Answer 9

It's so simple add all the float or double point numbers and store it in a result now set the precision to result

Answer 10

thanks @Zeke Williams I understood your code. it s easy now. @shanker this works if I eliminate the "0.2" and "0.9" in front of f and d variables.

Answer 11

Did you get it now !!!! 😅😁

Answer 12

Can I know what do uh want exactly for !

Answer 13

@shanker I wanted to know exactly the output for your own example. My problem was to calculate the arithmetic sum of some given numbers and display that value with a specific number of decimal places.

Answer 14

Bro it wont work because it is printing the .2 and .9 of the float and double values

Answer 15

It's ok @shanker 😂😂 Thank you for your interest anyway

Answer 16

It's just. Because of uh 👻 just kidding only about the program !!! 🙈

Answer 17

I told it's wrong when they r included and uh r saying when they are removed both r the same 😅😁

Answer 18

@shanker and what would be the output in your example? I'm afraid I didn't understand your explanation. Why did you use 0.2f instead of 0.9f? I tried your example and it didn't work, so what am I doing wrong?
https://code.sololearn.com/cVu4H4Z6UJ0q/?ref=app

Answer 19

@shanker not exactly.. sorry 😇😇 could you please write your own code and post it here?