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

This commit is contained in:
Arash Partow 2014-04-14 07:36:26 +10:00
parent 03c90e1893
commit f6a56d8048
3 changed files with 580 additions and 195 deletions
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538
exprtk.hpp
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131
exprtk_test.cpp
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@ -1028,7 +1028,31 @@ static const test_t test_list[] =
test_t("((1 + 1) < 3 ? 7 : 9) == 7",1.0), test_t("((1 + 1) < 3 ? 7 : 9) == 7",1.0),
test_t("((1 + 1) < (3 + 3) ? 7 : 9) == 7",1.0), test_t("((1 + 1) < (3 + 3) ? 7 : 9) == 7",1.0),
test_t("(min(1,2) ? 1 + 3 : 1 + 4) == 4",1.0), test_t("(min(1,2) ? 1 + 3 : 1 + 4) == 4",1.0),
test_t("(min(0,1) ? 1 + 3 : 1 + 4) == 5",1.0) test_t("(min(0,1) ? 1 + 3 : 1 + 4) == 5",1.0),
test_t("if(1 < 2) 3; == 3",1.0),
test_t("if(1 > 2) 3; == null",1.0),
test_t("if(1 < 2) 3; else 4; == 3",1.0),
test_t("if(1 > 2) 3; else 4; == 4",1.0),
test_t("if(1 < 2) 3; else {1+2; 4;} == 3",1.0),
test_t("if(1 > 2) 3; else {1+2; 4;} == 4",1.0),
test_t("if(1 < 2) 3; else if (1 < 2) 4; == 3",1.0),
test_t("if(1 > 2) 3; else if (1 < 2) 4; == 4",1.0),
test_t("if(1 > 2) 3; else if (1 > 2) 4; == null",1.0),
test_t("if(1 < 2) 3; else if (1 < 2) {1+2; 4;} == 3",1.0),
test_t("if(1 > 2) 3; else if (1 < 2) {1+2; 4;} == 4",1.0),
test_t("if(1 > 2) 3; else if (1 > 2) {1+2; 4;} == null",1.0),
test_t("if(1 < 2) { 1+2; 3;} == 3",1.0),
test_t("if(1 > 2) { 1+2; 3;} == null",1.0),
test_t("if(1 < 2) { 1+2; 3;} else 4; == 3",1.0),
test_t("if(1 > 2) { 1+2; 3;} else 4; == 4",1.0),
test_t("if(1 < 2) { 1+2; 3;} else {1+2; 4;} == 3",1.0),
test_t("if(1 > 2) { 1+2; 3;} else {1+2; 4;} == 4",1.0),
test_t("if(1 < 2) { 1+2; 3;} else if (1 < 2) 4; == 3",1.0),
test_t("if(1 > 2) { 1+2; 3;} else if (1 < 2) 4; == 4",1.0),
test_t("if(1 > 2) { 1+2; 3;} else if (1 > 2) 4; == null",1.0),
test_t("if(1 < 2) { 1+2; 3;} else if (1 < 2) {1+2; 4;} == 3",1.0),
test_t("if(1 > 2) { 1+2; 3;} else if (1 < 2) {1+2; 4;} == 4",1.0),
test_t("if(1 > 2) { 1+2; 3;} else if (1 > 2) {1+2; 4;} == null",1.0)
}; };
static const std::size_t test_list_size = sizeof(test_list) / sizeof(test_t); static const std::size_t test_list_size = sizeof(test_list) / sizeof(test_t);
@ -1164,13 +1188,14 @@ struct test_xy
}; };
template <typename T> template <typename T>
struct test_xyz struct test_xyzw
{ {
test_xyz(std::string e, const T& v0, const T& v1, const T& v2, const T& r) test_xyzw(std::string e, const T& v0, const T& v1, const T& v2, const T& v3, const T& r)
: expr(e), : expr(e),
x(v0), x(v0),
y(v1), y(v1),
z(v2), z(v2),
w(v3),
result(r) result(r)
{} {}
@ -1178,6 +1203,7 @@ struct test_xyz
T x; T x;
T y; T y;
T z; T z;
T w;
T result; T result;
}; };
@ -1537,51 +1563,63 @@ inline bool run_test01()
} }
{ {
static const test_xyz<T> test_list[] = static const test_xyzw<T> test_list[] =
{ {
test_xyz<T>("((x / y) / z )",T(7.0),T(9.0),T(3.0),T(((7.0 / 9.0) / 3.0 ))), test_xyzw<T>("((x / y) / z )",T(7.0),T(9.0),T(3.0),T(0.0),T(((7.0 / 9.0) / 3.0 ))),
test_xyz<T>("((x / y) / 2 )",T(7.0),T(9.0),T(3.0),T(((7.0 / 9.0) / 2.0 ))), test_xyzw<T>("((x / y) / 2 )",T(7.0),T(9.0),T(3.0),T(0.0),T(((7.0 / 9.0) / 2.0 ))),
test_xyz<T>("((x / 2) / y )",T(7.0),T(9.0),T(3.0),T(((7.0 / 2.0) / 9.0 ))), test_xyzw<T>("((x / 2) / y )",T(7.0),T(9.0),T(3.0),T(0.0),T(((7.0 / 2.0) / 9.0 ))),
test_xyz<T>("((2 / x) / y )",T(7.0),T(9.0),T(3.0),T(((2.0 / 7.0) / 9.0 ))), test_xyzw<T>("((2 / x) / y )",T(7.0),T(9.0),T(3.0),T(0.0),T(((2.0 / 7.0) / 9.0 ))),
test_xyz<T>("( x / (y / z))",T(7.0),T(9.0),T(3.0),T(( 7.0 / (9.0 / 3.0)))), test_xyzw<T>("( x / (y / z))",T(7.0),T(9.0),T(3.0),T(0.0),T(( 7.0 / (9.0 / 3.0)))),
test_xyz<T>("( x / (y / 2))",T(7.0),T(9.0),T(3.0),T(( 7.0 / (9.0 / 2.0)))), test_xyzw<T>("( x / (y / 2))",T(7.0),T(9.0),T(3.0),T(0.0),T(( 7.0 / (9.0 / 2.0)))),
test_xyz<T>("( x / (2 / y))",T(7.0),T(9.0),T(3.0),T(( 7.0 / (2.0 / 9.0)))), test_xyzw<T>("( x / (2 / y))",T(7.0),T(9.0),T(3.0),T(0.0),T(( 7.0 / (2.0 / 9.0)))),
test_xyz<T>("( 2 / (x / y))",T(7.0),T(9.0),T(3.0),T(( 2.0 / (7.0 / 9.0)))), test_xyzw<T>("( 2 / (x / y))",T(7.0),T(9.0),T(3.0),T(0.0),T(( 2.0 / (7.0 / 9.0)))),
test_xyz<T>("([(min(x,y) + z) + 3] - 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) + 3.0) - 4.0))), test_xyzw<T>("([(min(x,y) + z) + 3] - 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) + 3.0) - 4.0))),
test_xyz<T>("([(min(x,y) + z) + 3] + 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) + 3.0) + 4.0))), test_xyzw<T>("([(min(x,y) + z) + 3] + 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) + 3.0) + 4.0))),
test_xyz<T>("([(min(x,y) + z) + 3] * 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) + 3.0) * 4.0))), test_xyzw<T>("([(min(x,y) + z) + 3] * 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) + 3.0) * 4.0))),
test_xyz<T>("([(min(x,y) + z) + 3] / 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) + 3.0) / 4.0))), test_xyzw<T>("([(min(x,y) + z) + 3] / 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) + 3.0) / 4.0))),
test_xyz<T>("([(min(x,y) + z) - 3] - 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) - 3.0) - 4.0))), test_xyzw<T>("([(min(x,y) + z) - 3] - 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) - 3.0) - 4.0))),
test_xyz<T>("([(min(x,y) + z) - 3] + 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) - 3.0) + 4.0))), test_xyzw<T>("([(min(x,y) + z) - 3] + 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) - 3.0) + 4.0))),
test_xyz<T>("([(min(x,y) + z) - 3] * 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) - 3.0) * 4.0))), test_xyzw<T>("([(min(x,y) + z) - 3] * 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) - 3.0) * 4.0))),
test_xyz<T>("([(min(x,y) + z) - 3] / 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) - 3.0) / 4.0))), test_xyzw<T>("([(min(x,y) + z) - 3] / 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) - 3.0) / 4.0))),
test_xyz<T>("([(min(x,y) + z) * 3] - 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) * 3.0) - 4.0))), test_xyzw<T>("([(min(x,y) + z) * 3] - 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) * 3.0) - 4.0))),
test_xyz<T>("([(min(x,y) + z) * 3] + 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) * 3.0) + 4.0))), test_xyzw<T>("([(min(x,y) + z) * 3] + 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) * 3.0) + 4.0))),
test_xyz<T>("([(min(x,y) + z) * 3] * 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) * 3.0) * 4.0))), test_xyzw<T>("([(min(x,y) + z) * 3] * 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) * 3.0) * 4.0))),
test_xyz<T>("([(min(x,y) + z) * 3] / 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) * 3.0) / 4.0))), test_xyzw<T>("([(min(x,y) + z) * 3] / 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) * 3.0) / 4.0))),
test_xyz<T>("([(min(x,y) + z) / 3] - 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) / 3.0) - 4.0))), test_xyzw<T>("([(min(x,y) + z) / 3] - 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) / 3.0) - 4.0))),
test_xyz<T>("([(min(x,y) + z) / 3] + 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) / 3.0) + 4.0))), test_xyzw<T>("([(min(x,y) + z) / 3] + 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) / 3.0) + 4.0))),
test_xyz<T>("([(min(x,y) + z) / 3] * 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) / 3.0) * 4.0))), test_xyzw<T>("([(min(x,y) + z) / 3] * 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) / 3.0) * 4.0))),
test_xyz<T>("([(min(x,y) + z) / 3] / 4)",T(5.0),T(7.0),T(9.0),T((((std::min(5.0,7.0) + 9.0) / 3.0) / 4.0))), test_xyzw<T>("([(min(x,y) + z) / 3] / 4)",T(5.0),T(7.0),T(9.0),T(0.0),T((((std::min(5.0,7.0) + 9.0) / 3.0) / 4.0))),
test_xyz<T>("(4 - [3 + (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 - (3.0 + (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 - [3 + (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 - (3.0 + (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 + [3 + (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 + (3.0 + (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 + [3 + (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 + (3.0 + (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 * [3 + (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 * (3.0 + (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 * [3 + (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 * (3.0 + (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 / [3 + (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 / (3.0 + (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 / [3 + (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 / (3.0 + (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 - [3 - (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 - (3.0 - (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 - [3 - (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 - (3.0 - (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 + [3 - (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 + (3.0 - (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 + [3 - (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 + (3.0 - (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 * [3 - (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 * (3.0 - (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 * [3 - (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 * (3.0 - (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 / [3 - (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 / (3.0 - (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 / [3 - (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 / (3.0 - (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 - [3 * (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 - (3.0 * (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 - [3 * (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 - (3.0 * (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 + [3 * (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 + (3.0 * (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 + [3 * (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 + (3.0 * (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 * [3 * (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 * (3.0 * (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 * [3 * (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 * (3.0 * (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 / [3 * (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 / (3.0 * (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 / [3 * (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 / (3.0 * (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 - [3 / (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 - (3.0 / (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 - [3 / (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 - (3.0 / (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 + [3 / (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 + (3.0 / (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 + [3 / (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 + (3.0 / (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 * [3 / (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 * (3.0 / (std::min(5.0,7.0) + 9.0))))), test_xyzw<T>("(4 * [3 / (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 * (3.0 / (std::min(5.0,7.0) + 9.0))))),
test_xyz<T>("(4 / [3 / (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T((4.0 / (3.0 / (std::min(5.0,7.0) + 9.0))))) test_xyzw<T>("(4 / [3 / (min(x,y) + z)])",T(5.0),T(7.0),T(9.0),T(0.0),T((4.0 / (3.0 / (std::min(5.0,7.0) + 9.0))))),
test_xyzw<T>("if(x < y) { z+2; z;} == z" ,T(1.0),T(2.0),T(3.0),T(4.0),T(1.0)),
test_xyzw<T>("if(x > y) { z+2; z;} == null" ,T(1.0),T(2.0),T(3.0),T(4.0),T(1.0)),
test_xyzw<T>("if(x < y) { z+2; z;} else w; == z" ,T(1.0),T(2.0),T(3.0),T(4.0),T(1.0)),
test_xyzw<T>("if(x > y) { z+2; z;} else 1 + w; == (w + 1)" ,T(1.0),T(2.0),T(3.0),T(4.0),T(1.0)),
test_xyzw<T>("if(x < y) { z+2; z;} else {1+2; w;} == z" ,T(1.0),T(2.0),T(3.0),T(4.0),T(1.0)),
test_xyzw<T>("if(x > y) { z+2; z;} else {1+2; w;} == w" ,T(1.0),T(2.0),T(3.0),T(4.0),T(1.0)),
test_xyzw<T>("if(x < y) { z+2; z;} else if (x < y) w; == z" ,T(1.0),T(2.0),T(3.0),T(4.0),T(1.0)),
test_xyzw<T>("if(x > y) { z+2; z;} else if (x < y) 1 + w; == w + 1" ,T(1.0),T(2.0),T(3.0),T(4.0),T(1.0)),
test_xyzw<T>("if(x > y) { z+2; z;} else if (x > y) w; == null" ,T(1.0),T(2.0),T(3.0),T(4.0),T(1.0)),
test_xyzw<T>("if(x < y) { z+2; z;} else if (x < y) {w+2; w;} == z" ,T(1.0),T(2.0),T(3.0),T(4.0),T(1.0)),
test_xyzw<T>("if(x > y) { z+2; z;} else if (x < y) {w+2; w;} == w" ,T(1.0),T(2.0),T(3.0),T(4.0),T(1.0)),
test_xyzw<T>("if(x > y) { z+2; z;} else if (x > y) {w+2; w;} == null",T(1.0),T(2.0),T(3.0),T(4.0),T(1.0))
}; };
static const std::size_t test_list_size = sizeof(test_list) / sizeof(test_xyz<T>); static const std::size_t test_list_size = sizeof(test_list) / sizeof(test_xyzw<T>);
const std::size_t rounds = 60; const std::size_t rounds = 60;
@ -1590,12 +1628,13 @@ inline bool run_test01()
bool loop_result = true; bool loop_result = true;
for (std::size_t i = 0; i < test_list_size; ++i) for (std::size_t i = 0; i < test_list_size; ++i)
{ {
test_xyz<T>& test = const_cast<test_xyz<T>&>(test_list[i]); test_xyzw<T>& test = const_cast<test_xyzw<T>&>(test_list[i]);
exprtk::symbol_table<T> symbol_table; exprtk::symbol_table<T> symbol_table;
symbol_table.add_variable("x",test.x); symbol_table.add_variable("x",test.x);
symbol_table.add_variable("y",test.y); symbol_table.add_variable("y",test.y);
symbol_table.add_variable("z",test.z); symbol_table.add_variable("z",test.z);
symbol_table.add_variable("w",test.w);
exprtk::expression<T> expression; exprtk::expression<T> expression;
expression.register_symbol_table(symbol_table); expression.register_symbol_table(symbol_table);

42
readme.txt
View File

@ -354,11 +354,11 @@ include path (e.g: /usr/include/).
+----------+---------------------------------------------------------+ +----------+---------------------------------------------------------+
| [r0:r1] | The closed interval [r0,r1] of the specified string. | | [r0:r1] | The closed interval [r0,r1] of the specified string. |
| | eg: Given a string x with a value of 'abcdefgh' then: | | | eg: Given a string x with a value of 'abcdefgh' then: |
| | 0. x[1:4] == 'bcde' | | | 1. x[1:4] == 'bcde' |
| | 1. x[ :5] == x[:5] == 'abcdef' | | | 2. x[ :5] == x[:5] == 'abcdef' |
| | 2. x[3: ] == x[3:] =='cdefgh' | | | 3. x[3: ] == x[3:] =='cdefgh' |
| | 3. x[ : ] == x[:] == 'abcdefgh' | | | 4. x[ : ] == x[:] == 'abcdefgh' |
| | 4. x[4/2:3+2] == x[2:5] == 'cdef' | | | 5. x[4/2:3+2] == x[2:5] == 'cdef' |
| | | | | |
| | Note: Both r0 and r1 are assumed to be integers, where | | | Note: Both r0 and r1 are assumed to be integers, where |
| | r0 <= r1. They may also be the result of an expression, | | | r0 <= r1. They may also be the result of an expression, |
@ -371,7 +371,27 @@ include path (e.g: /usr/include/).
|STRUCTURE | DEFINITION | |STRUCTURE | DEFINITION |
+----------+---------------------------------------------------------+ +----------+---------------------------------------------------------+
| if | If x is true then return y else return z. | | if | If x is true then return y else return z. |
| | (eg: if(x, y, z) or if((x + 1) > 2y, z + 1, w / v)) | | | eg: |
| | 1. if(x, y, z) |
| | 2. if((x + 1) > 2y, z + 1, w / v) |
+----------+---------------------------------------------------------+
| if-else | The if-else/else-if statement. Subject to the condition |
| | branch the statement will return either the value of the|
| | consequent or the alternative branch. |
| | eg: |
| | 1. if (x > y) z; else w; |
| | 2. if (x > y) z; else if (w != u) v; |
| | 3. if (x < y) {z; w+1;} else u; |
| | 4. if ((x != y) and (z > w)) |
| | { |
| | y := sin(x) / u; |
| | z := w+1; |
| | } |
| | else if (x > (z + 1)) |
| | { |
| | w := abs (x - y) + z; |
| | u := (x + 1) > 2y ? 2u : 3u; |
| | } |
+----------+---------------------------------------------------------+ +----------+---------------------------------------------------------+
| switch | The first true case condition that is encountered will | | switch | The first true case condition that is encountered will |
| | determine the result of the switch. If none of the case | | | determine the result of the switch. If none of the case |
@ -410,9 +430,9 @@ include path (e.g: /usr/include/).
| ?: | Ternary conditional statement, similar to that of the | | ?: | Ternary conditional statement, similar to that of the |
| | above denoted if-statement. | | | above denoted if-statement. |
| | eg: | | | eg: |
| | 0. x ? y : z | | | 1. x ? y : z |
| | 1. x + 1 > 2y ? z + 1 : (w / v) | | | 2. x + 1 > 2y ? z + 1 : (w / v) |
| | 2. min(x,y) > z ? (x < y + 1) ? x : y : (w * v) | | | 3. min(x,y) > z ? (x < y + 1) ? x : y : (w * v) |
+----------+---------------------------------------------------------+ +----------+---------------------------------------------------------+
| ~ | Evaluate each sub-expression, then return as the result | | ~ | Evaluate each sub-expression, then return as the result |
| | the value of the last sub-expression. This is sometimes | | | the value of the last sub-expression. This is sometimes |
@ -433,8 +453,8 @@ include path (e.g: /usr/include/).
| | } | | | } |
+----------+---------------------------------------------------------+ +----------+---------------------------------------------------------+
Note: In the above tables, the symbols x, y, z and w where appropriate Note: In the above tables, the symbols x, y, z, w, u and v where
can represent any of one the following: appropriate may represent any of one the following:
1. Literal numeric/string value 1. Literal numeric/string value
2. A variable 2. A variable