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Old 05-09-2005, 12:17 PM   #1
edM
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assigning a large float number in E notation


hi,

how do you assign a large flatoing point number in C, is the syntax below correct?


float number1 = 2.302E-12; //delcare & assign
.
.
.
.
printf("%f", number1);


when i went to print it out all i got was '0.000000'



thanks
 
Old 05-09-2005, 01:03 PM   #2
enemorales
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Code:
 float number1 = 2.302E-12
Well, this is actually a very SMALL number: about 0.000000000002302, to be more precise. This is because you put a MINUS (E-12) . Did you mean 2.302E12? (Which i think it is also 2.302E+12)
 
Old 05-09-2005, 01:03 PM   #3
Hko
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Re: assigning a large float number in E notation

Quote:
Originally posted by edM
float number1 = 2.302E-12; //delcare & assign
[...]
printf("%f", number1);

when i went to print it out all i got was '0.000000'
printf()'s defaults to 6 digits after the decimal point for "%f " conversion. And 2.302E-12 is smaller than 0.000000, so it's rounded to zero.

Either printf if in E-notatation:
Code:
printf("%E\n", number1);
Or specify how much digits after the decimal point should be output (precision), e.g. to get 15 digits:
Code:
printf("%.15f\n", number1);

Last edited by Hko; 05-09-2005 at 01:05 PM.
 
Old 05-09-2005, 01:51 PM   #4
edM
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enemorales yes i meant large as in small.


thanks both you, very helpful!
 
  


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