Changeset 29092213 for doc/theses/jiada_liang_MMath

Timestamp:

Jun 25, 2024, 12:04:59 PM (5 months ago)

Author:

Peter A. Buhr <pabuhr@…>

Branches:

master

Children:

41f4e2d

Parents:

3b69398

Message:

update planet example program

File:

• doc/theses/jiada_liang_MMath/CFAenum.tex (modified) (5 diffs)

doc/theses/jiada_liang_MMath/CFAenum.tex

@@ -391 +391 @@
 The unnamed enumeration provides the gravitational-constant enumerator @G@.
 Function @surfaceGravity@ uses the @with@ clause to remove @p@ qualification from fields @mass@ and @radius@.
-The program main uses @SizeE@ to obtain the number of enumerators in @Planet@, and safely converts the random value into a @Planet@ enumerator.
-The resulting random orbital-body is used in a \CFA @choose@ statement.
-The enumerators in the @case@ clause use position for testing.
-The prints use @labelE@ to print an enumerator's label.
-Finally, a loop iterates through the planets computing the weight on each planet for a given earth mass.
-The print statement does an equality comparison with an enumeration variable and enumerator.
+The program main uses the pseudo function @countof@ to obtain the number of enumerators in @Planet@, and safely converts the random value into a @Planet@ enumerator using @fromInt@.
+The resulting random orbital-body is used in a @choose@ statement.
+The enumerators in the @case@ clause use enumerator position for testing.
+The prints use @label@ to print an enumerator's name.
+Finally, a loop enumerates through the planets computing the weight on each planet for a given earth mass.
+The print statement does an equality comparison with an enumeration variable and enumerator (@p == MOON@).
 
 \begin{figure}
@@ -402 +402 @@
 \begin{cfa}
 struct MR { double mass, radius; };
-enum( @MR@ ) Planet {
+enum( @MR@ ) Planet {                                           $\C{// typed enumeration}$
         //                      mass (kg)   radius (km)
         MERCURY = { 0.330_E24, 2.4397_E6 },
         VENUS      = { 4.869_E24, 6.0518_E6 },
         EARTH       = { 5.976_E24, 6.3781_E6 },
-        MOON        = { 7.346_E22, 1.7380_E6 }, $\C{// not a planet}$
+        MOON        = { 7.346_E22, 1.7380_E6 }, $\C{// not a planet}$
         MARS         = { 0.642_E24, 3.3972_E6 },
         JUPITER    = { 1898._E24, 71.492_E6 },
@@ -413 +413 @@
         URANUS    = { 86.86_E24, 25.559_E6 },
         NEPTUNE  = { 102.4_E24, 24.746_E6 },
-};
-enum( double ) { G = 6.6743_E-11 }; $\C{// universal gravitational constant (m3 kg-1 s-2)}$
+        PLUTO       = { 1.303_E22, 1.1880_E6 }, $\C{// not a planet}$
+};
+enum( double ) { G = 6.6743_E-11 };                     $\C{// universal gravitational constant (m3 kg-1 s-2)}$
 static double surfaceGravity( Planet p ) @with( p )@ {
-        return G * mass / ( radius \ 2 ); $\C{// exponentiation}$
+        return G * mass / ( radius @\@ 2 );             $\C{// no qualification, exponentiation}$
 }
 static double surfaceWeight( Planet p, double otherMass ) {
@@ -422 +423 @@
 }
 int main( int argc, char * argv[] ) {
-        if ( argc != 2 ) exit | "Usage: " | argv[0] | "earth-weight";
+        if ( argc != 2 ) @exit@ | "Usage: " | argv[0] | "earth-weight";  // terminate program
         double earthWeight = convert( argv[1] );
         double earthMass = earthWeight / surfaceGravity( EARTH );
-
-        Planet p = @fromInt@( prng( @SizeE@(Planet) ) ); $\C{// select a random orbiting body}$
-        @choose( p )@ {
+        Planet rp = @fromInt@( prng( @countof@( Planet ) ) ); $\C{// select random orbiting body}$
+        @choose( rp )@ {                                                $\C{// implicit breaks}$
           case MERCURY, VENUS, EARTH, MARS:
-                sout | @labelE( p )@ | "is a rocky planet";
-          @case JUPITER, SATURN, URANUS, NEPTUNE:@
-                sout | labelE( p ) | "is a gas-giant planet";
+                sout | @label( rp )@ | "is a rocky planet";
+          case JUPITER, SATURN, URANUS, NEPTUNE:
+                sout | label( rp ) | "is a gas-giant planet";
           default:
-                sout | labelE( p ) | "is not a planet";
+                sout | label( rp ) | "is not a planet";
         }
-        for ( @p; Planet@ ) {
-                sout | "Your weight on" | (@p == MOON@ ? "the" : "") | labelE(p)
-                           | "is" | wd( 1,1, surfaceWeight( p, earthMass ) ) | "kg";
+        for ( @p; Planet@ ) {                                   $\C{// enumerate}$
+                sout | "Your weight on" | ( @p == MOON@ ? "the" : " " ) | label( p )
+                           | "is" | wd( 1,1,  surfaceWeight( p, earthMass ) ) | "kg";
         }
 }
@@ -451 +451 @@
 Your weight on URANUS is 90.5 kg
 Your weight on NEPTUNE is 113.8 kg
+Your weight on PLUTO is 6.3 kg
 \end{cfa}
 \caption{Planet Example}