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mpfr_libmpfr_vasprintf Method (ptrchar_ptr, String, Object)
Write output as a null terminated string in a block of memory allocated using the allocation function (see GNU MPFR - Memory Handling).

Namespace:  Math.Mpfr.Native
Assembly:  Math.Mpfr.Native (in Math.Mpfr.Native.dll) Version: 1.0.0.0 (1.0.0.0)
Syntax
Copy
public static int mpfr_vasprintf(
	ptr<char_ptr> str,
	string template,
	params Object[] arguments
)

Parameters

str
Type: Math.Gmp.Nativeptrchar_ptr
The output string.
template
Type: SystemString
Format string. See Formatted Output Functions.
arguments
Type: SystemObject
Arguments.

Return Value

Type: Int32
The return value is the number of characters written in the string, excluding the null-terminator, or a negative value if an error occurred, in which case the contents of str are undefined.
Remarks

A pointer to the block is stored in str. The block of memory must be freed using mpfr_free_str.

Examples
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ptr<char_ptr> str = new ptr<char_ptr>();

mpfr_t r = "12345e6";
Assert.IsTrue(mpfr_lib.mpfr_vasprintf(str, "%Re", r) == 10);
Assert.IsTrue(str.Value.ToString() == "1.2345e+10");
gmp_lib.free(str.Value);
Assert.IsTrue(mpfr_lib.mpfr_vasprintf(str, "%Rf", r) == 18);
Assert.IsTrue(str.Value.ToString() == "12345000000.000000");
gmp_lib.free(str.Value);
Assert.IsTrue(mpfr_lib.mpfr_vasprintf(str, "%Rg", r) == 10);
Assert.IsTrue(str.Value.ToString() == "1.2345e+10");
gmp_lib.free(str.Value);
Assert.IsTrue(mpfr_lib.mpfr_vasprintf(str, "%Ra", r) == 15);
Assert.IsTrue(str.Value.ToString() == "0x2.dfd1c04p+32");
gmp_lib.free(str.Value);
 mpfr_lib.mpfr_clear(r);
See Also