Doubt in C

[abhi_10_20]

Dunno whether its right to post it here....

Anyway, this is my doubt:

i couldn't find this in Google.......

---> if we declare a float, like:

float a=2.7;

it gets stored in the memory as 2.700000 with specifically 6 digits only, after the decimal point. Why? (may be related to its format)

 

[nileshgr]

Dunno whether its right to post it here....

Anyway, this is my doubt:

i couldn't find this in Google.......

---> if we declare a float, like:

float a=2.7;

it gets stored in the memory as 2.700000 with specifically 6 digits only, after the decimal point. Why? (may be related to its format)

It's predefined in the compiler. This is probably the wrong sect. it shud go in s/w troubleshooting.

 

[47shailesh]

Yes by default it is upto 6 point decimal...

But if you want it to 3 point decimal than use %.3f in the print statement to get result in upto 3 place of decimal

e.g.

printf("salary is %.3f\n", salary );

For in depth Knowledge read Dennis Ritche

 

[mediator]

U can set any precision u want! Check my code

#include <iomanip.h>
#include <iostream.h>
int main()
{
int p;
cout<<"Mediator asked to enter precision u wanna set : "; cin>>p;
double x(3.14);
cout <<"x = "<<fixed <<setprecision(p)<<x<<'\n';
cout <<"x/3 = "<<fixed <<setprecision(p)<<(x/3)<<'\n';
return 0;
}

U can set any precision using setprecision! Don't try large numbers or ur terminal might hang! I tried "100000000000" as precision and had to kill the program then!!

 

[abhi_10_20]

thanks for your replies......

but still not satisfied somewhat...
i think it goes with the storage space reserved........like float requires 4 bytes
in a standard turbo c compiler.....and we need to do some 'masala munch' with these 4 bytes.....

 

[nileshgr]

U can set any precision u want! Check my code

U can set any precision using setprecision! Don't try large numbers or ur terminal might hang! I tried "100000000000" as precision and had to kill the program then!!

Buddy, abhi_10_20 is talking about C. Your code is C++!

 

[mediator]

^^But his precise problem is about float!

 

[nileshgr]

^^But his precise problem is about float!

ok.

 

[abhi_10_20]

isn't setprecision() found in C ?

 

[mediator]

setprecision is found from library "iomanip.h" and it doesn't matter if its c or c++ afaik!

 

[nileshgr]

If you want a detailed manual on programming in C, see snip

i have uploaded it.
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[abhi_10_20]

another c book into my kitty........
man...i can start a big library with my pdf's....

 

[nileshgr]

another c book into my kitty........
man...i can start a big library with my pdf's....

Ha hA ha ha.

 

[47shailesh]

If you want a detailed manual on programming in C, see snip

Same book i was talkin about..

in the pdf mentiontioned page number 22 gives the idea about your problem

 

[abhi1301]

Ha hA ha ha.

Or u better start trusting the replies in here .. Shilesh is perfectly correct .. it's 6 point precision by default and u cannot do anything about it if u want the value just 1 or 2 places do it just like it's written .. change the precision of output wid
printf("salary is %.3f\n", salary );

being more clear this will print upto 3 places after decimal if u write
printf("salary is %.2f\n", salary );

this prints 2 values and so on ..

 

[47shailesh]

snip

this book is "W. Kernighan and Dennis M. Ritchie" is it not a copyright voilation.. if so then remove the link please..

 

[nileshgr]

this book is "W. Kernighan and Dennis M. Ritchie" is it not a copyright voilation.. if so then remove the link please..

I don't know. It was given to me by a frnd.