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# General Programming Concepts: Writing and Debugging Programs

## List of 128-Bit Long Double Numerical Manipulation Subroutines

The following subroutines perform numerical manipulation of floating-point numbers stored in the 128-bit long double data type. These subroutines do not support the 64-bit long double data type. Applications that use the 64-bit long double data type should use the corresponding double-precision subroutines.

 acosl Computes the inverse cosine of a floating-point number in long double format asinl Computes the inverse sine of a floating-point number in long double format atan2l Computes the principal value of the arc tangent of x/y, whose components are expressed in long double format atanl Computes the inverse tangent of a floating-point number in long double format ceill Computes the smallest integral value not less than a specified floating-point number in long double format coshl Computes the hyperbolic cosine of a floating-point number in long double format cosl Computes the cosine of a floating-point number in long double format erfcl Computes the value of 1 minus the error function of a floating-point number in long double format erfl Computes the error function of a floating-point number in long double format expl Computes the exponential function of a floating-point number in long double format fabsl Computes the absolute value of a floating-point number in long double format floorl Computes the largest integral value not greater than a specified floating-point number in long double format fmodl Computes the long double remainder of a fraction x/y, where x and y are floating-point numbers in long double format frexpl Expresses a floating-point number in long double format as a normalized fraction and an integral power of 2, storing the integer and returning the fraction ldexpl Multiplies a floating-point number in long double format by an integral power of 2 lgammal Computes the natural logarithm of the absolute value of the gamma function of a floating-point number in long double format log10l Computes the base 10 logarithm of a floating-point number in long double format logl Computes the natural logarithm of a floating-point number in long double format modfl Stores the integral part of a real number in a long double variable and returns the fractional part of the real number powl Computes the value of x raised to the power of y, where both numbers are floating-point numbers in long double format sinhl Computes the hyperbolic sine of a floating-point number in long double format sinl Computes the sine of a floating-point number in long double format sqrtl Computes the square root of a floating-point number in long double format strtold Converts a string to a floating-point number in long double format tanl Computes the tangent of a floating-point number in long double format tanhl Computes the hyperbolic tangent of a floating-point number in long double format

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