Get floating-point value from mantissa and exponent

#include <math.h>
#include <stdio.h>

int main(void)
{
  printf("%f", ldexp(1,2));

  return 0;
}

1.	Calculate exponential: how to use exp
2.	Get mantissa and exponent of floating-point value: how to use frexp
3.	Get floating-point value from mantissa and exponent: how to use ldexp

Get floating-point value from mantissa and exponent : Exp « Math « C / ANSI-C