Square Root(Brute force)

#1

result of square root shows up to 5 digits only(after decimal) although I gave it precison of 10.
Eg. square root of 10 with precision 10 gives output 3.16228
also i have change the ans from float to double still not works???

#2

Hi @pm20080,
try using dis,
double n=1.
cout << fixed << setprecision(10) << pi <<" "<<n<<endl;
dis will give decimal values upto 10 decimal places.
use above methods in questions where it is given to print ans upto m decimal places.
Hope dis resolves ur doubt.

1 Like
#3

thank u sir!!! but I have to do it without using predefined function: Here is my code of Brute force algo:-

#include
#include <stdlib.h>
using namespace std;

int main()
{
int n,p;
cin>>n>>p;
double ans=0;
float inc=1.0;

while((p+1)!=0)
{
    while(ans*ans<=n)
    {
        ans+=inc;
    }
    ans=ans-inc;
    inc=inc/10;
    p--;
}

cout<<ans<<endl;
system("pause");
return 0;

}

So when if give input : 10 10
output: 3.16228

#4

@pm20080, without using setprecision fuction or any other function, u can print only upto 6 decimal places(at max). Ur code for calculating ans is write but while outputting,the ans is rounded off. eg. if ans=3.162277,output ur code will give is 3.16228. So,in order to get upto 10 decimal places in ur printed output, use above method or
printf("%.10f",ans);
If u still hv any doubt, pls post them here.

1 Like
#5

so its actually kind of predefined inside C++ to round off to 5 decimal precision and so if we require more precision, we will hv to do it this way.
I got it.

THANK U SO MUCH SIR!!! IT WAS REALLY HELPFULL!!!

#6

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