function
<cmath> <ctgmath>
modf
double modf (double x, double* intpart);
double modf (double x , double* intpart); float modff (float x , float* intpart);long double modfl (long double x, long double* intpart);
double modf (double x , double* intpart); float modf (float x , float* intpart);long double modf (long double x, long double* intpart);
double modf (double x , double* intpart); float modf (float x , float* intpart);long double modf (long double x, long double* intpart); double modf (T x , double* intpart); // additional overloads
Break into fractional and integral parts
Breaks x into an integral and a fractional part.
The integer part is stored in the object pointed by intpart, and the fractional part is returned by the function.
Both parts have the same sign as x.
Additional overloads are provided in this header (
<cmath>) for the
integral types: These overloads effectively cast
x to a
double before calculations (defined for
T being any
integral type).
Parameters
- x
- Floating point value to break into parts.
- intpart
- Pointer to an object (of the same type as x) where the integral part is stored with the same sign as x.
Return Value
The fractional part of x, with the same sign.
Example
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/* modf example */
#include <stdio.h> /* printf */
#include <math.h> /* modf */
int main ()
{
double param, fractpart, intpart;
param = 3.14159265;
fractpart = modf (param , &intpart);
printf ("%f = %f + %f \n", param, intpart, fractpart);
return 0;
}
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Output:
3.141593 = 3.000000 + 0.141593
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See also
- ldexp
- Generate value from significand and exponent (function)
- frexp
- Get significand and exponent (function)