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C++ Mathematical Expression Library (ExprTk) http://www.partow.net/programming/exprtk/index.html

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Arash Partow
2018-03-11 12:00:26 +11:00
parent 56cb1186b7
commit 55759bb04c
3 changed files with 31 additions and 31 deletions
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35
exprtk_simple_example_10.cpp
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@ -45,22 +45,23 @@ void newton_sqrt()
.add(
function_t( // define function: newton_sqrt(x)
"newton_sqrt",
" switch "
" { "
" case x < 0 : -inf; "
" case x == 0 : 0; "
" case x == 1 : 1; "
" default: "
" ~{ "
" var z := 100; "
" var sqrt_x := x / 2; "
" repeat "
" sqrt_x := (1 / 2) * (sqrt_x + (x / sqrt_x)); "
" if (equal(sqrt_x^2, x)) "
" break[sqrt_x]; "
" until ((z -= 1) <= 0); "
" }; "
" } ",
" switch "
" { "
" case x < 0 : null; "
" case x == 0 : 0; "
" case x == 1 : 1; "
" default: "
" ~{ "
" var z := 100; "
" var sqrt_x := x / 2; "
" repeat "
" if (equal(sqrt_x^2, x)) "
" break[sqrt_x]; "
" else "
" sqrt_x := (1 / 2) * (sqrt_x + (x / sqrt_x)); "
" until ((z -= 1) <= 0); "
" }; "
" } ",
"x"));
std::string expression_str = "newton_sqrt(x)";
@ -77,7 +78,7 @@ void newton_sqrt()
T result = expression.value();
printf("sqrt(%03d) - Result: %12.10f\tReal: %12.10f\n",
printf("sqrt(%03d) - Result: %15.13f\tReal: %15.13f\n",
static_cast<unsigned int>(i),
result,
std::sqrt(x));