C modf() function

C modf() function - Floating-point remainder value function


double modf(double x, double *iptr)

The modf() function is used to break down the floating-point value x into fractional and integral parts.


Name Description Required /Optional
x Floating-point values. Required
iptr Floating-point values. Required

Return value from modf()

  • Returns the signed fractional portion of x.

Example: modf() function

The following example shows the usage of modf() function.

#include <math.h>
#include <stdio.h>
int main(void)
   double x, y, d;
   x = -14.876;
   y = modf(x, &d);
   printf("x = %lf\n", x);
   printf("Integral part = %lf\n", d);
   printf("Fractional part = %lf\n", y);
   x = 7654.887;
   y = modf(x, &d);
   printf("\nx = %lf\n", x);
   printf("Integral part = %lf\n", d);
   printf("Fractional part = %lf\n", y);


x = -14.876000
Integral part = -14.000000
Fractional part = -0.876000

x = 7654.887000
Integral part = 7654.000000
Fractional part = 0.887000

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