C Tutorial/Data Type/float number
Содержание
C provides two main floating-point representations: float (single precision) and double (double precision).
A floating-point number has a fractional part and a biased exponent.
Float occupies 4 bytes and double occupies 8 bytes.
2.17.float number 2.17.1. C provides two main floating-point representations: float (single precision) and double (double precision). 2.17.2. <A href="/Tutorial/C/0040__Data-Type/Formatsforrepresentingfloatingpoints.htm">Formats for representing floating points</a> 2.17.3. <A href="/Tutorial/C/0040__Data-Type/Usetheformatfforprintingfloatingnumbers.htm">Use the format %f for printing floating numbers</a> 2.17.4. <A href="/Tutorial/C/0040__Data-Type/Forprintingdoubleyoucanuself.htm">For printing double you can use %lf.</a>
Formats for representing floating points
<source lang="cpp">#include <stdio.h> main() {
float f1 = 0.23456;
float f2 = 2.3456E-1;
float f3 = .23456;
float f4 = .23456e-2;
float f5 = 2.3456E-4;
float f6 = -.232456E-4;
float f7 = 2345.6;
float f8 = 23.456E2;
float f9 = 23456e3;
printf("%e \n", f1);
printf("%e \n", f2);
printf("%e \n", f3);
printf("%e \n", f4);
printf("%e \n", f5);
printf("%e \n", f6);
printf("%e \n", f7);
printf("%e \n", f8);
printf("%e \n", f9);
}</source>
2.345600e-01
2.345600e-01
2.345600e-01
2.345600e-03
2.345600e-04
-2.324560e-05
2.345600e+03
2.345600e+03
2.345600e+07
For printing double you can use %lf.
<source lang="cpp">#include <stdio.h> main() {
double f1 = 123456789123456789.23456;
printf("%lf \n", f1);
}</source>
123456789123456784.000000
Use the format %f for printing floating numbers
<source lang="cpp">#include <stdio.h> main() {
float f1 = 0.23456;
printf("%f \n", f1);
}</source>
