Difference between revisions of "Syntax Comparison"

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Line 74: Line 74:
 
!Python
 
!Python
 
|-
 
|-
−
|'''TODO'''
+
|'''if/else'''
 +
| <pre>if ($a==$b) {
 +
    echo("same");
 +
} else {
 +
    echo("different");
 +
}
 +
</pre>
 +
| <pre>if (a==b) {
 +
    System.out.println("same");
 +
} else {
 +
    System.out.println("different");
 +
}
 +
</pre>
 
| <pre>TODO</pre>
 
| <pre>TODO</pre>
 +
| <pre>if a==b:
 +
    print 'same'
 +
else:
 +
    print 'different'
 +
</pre>
 +
|-
 +
|'''else-if'''
 +
| <pre>if ($a<0) {
 +
    echo("negative");
 +
} elseif ($a==0) {
 +
    echo("zero");
 +
} else {
 +
    echo("positive");
 +
}
 +
</pre>
 
| <pre>TODO</pre>
 
| <pre>TODO</pre>
 
| <pre>TODO</pre>
 
| <pre>TODO</pre>
 +
| <pre>if a<0:
 +
    print 'negative'
 +
elif a==0:
 +
    print 'zero'
 +
else:
 +
    print 'positive'
 +
</pre>
 +
|-
 +
|'''switch'''
 +
| <pre>switch ($i) {
 +
    case 0:
 +
        echo "i equals 0";
 +
        break;
 +
    case 1:
 +
        echo "i equals 1";
 +
        break;
 +
    case 2:
 +
        echo "i equals 2";
 +
        break;
 +
}
 +
</pre>
 +
| <pre>switch ($i) {
 +
    case 0:
 +
        System.out.println("i equals 0");
 +
        break;
 +
    case 1:
 +
        System.out.println("i equals 1");
 +
        break;
 +
    case 2:
 +
        System.out.println("i equals 2");
 +
        break;
 +
}
 +
</pre>
 
| <pre>TODO</pre>
 
| <pre>TODO</pre>
 +
| Python has no switch statement. Use "if" instead.
 
|}
 
|}
  

Revision as of 19:29, 23 January 2011

Students

This is a comparison of the syntax of some popular programming languages, including Scala which we will be using on 5CS004. Where you see the word "TODO", please collaborate to fill in the blank parts of the tables. We will be adding to this page as the module progresses.

Useful language references


Basics

PHP Java Scala Python
Single line comment 
// comment
 
// comment
 
// comment
 
# comment
Multi-line comment 
/* comment */
 
/* comment */
 
/* comment */
 Doesn't have multi-line comments.
Null object 
NULL
 
null
 
TODO
 
None
+,-,*,/,%,* 
+,-,*,/,%,*
 
+,-,*,/,%,*
 
+,-,*,/,%,*
 
+,-,*,/,%,*
True and false 
TRUE, FALSE
 
true, false
 
TODO
 
True, False
Boolean operators 
&&, ||, !
 
&&, ||, !
 
TODO
 
and, or, not
Relational operators 
<, >, <=, >=, ==, !=
 
<, >, <=, >=, ==, !=
 
<, >, <=, >=, ==, !=
 
<, >, <=, >=, ==, !=


Selection

PHP Java Scala Python
if/else 
if ($a==$b) {
    echo("same");
} else {
    echo("different");
}

if (a==b) {
    System.out.println("same");
} else {
    System.out.println("different");
}

TODO
 
if a==b:
    print 'same'
else:
    print 'different'
else-if 
if ($a<0) {
    echo("negative");
} elseif ($a==0) {
    echo("zero");
} else {
    echo("positive");
}

TODO
 
TODO
 
if a<0:
    print 'negative'
elif a==0:
    print 'zero'
else:
    print 'positive'
switch 
switch ($i) {
    case 0:
        echo "i equals 0";
        break;
    case 1:
        echo "i equals 1";
        break;
    case 2:
        echo "i equals 2";
        break;
}

switch ($i) {
    case 0:
        System.out.println("i equals 0");
        break;
    case 1:
        System.out.println("i equals 1");
        break;
    case 2:
        System.out.println("i equals 2");
        break;
}

TODO
 Python has no switch statement. Use "if" instead.

Iteration

PHP Java Scala Python
TODO 
TODO
 
TODO
 
TODO
 
TODO

Compound types (arrays, lists, etc)

PHP Java Scala Python
TODO 
TODO
 
TODO
 
TODO
 
TODO

Input / output

PHP Java Scala Python
TODO 
TODO
 
TODO
 
TODO
 
TODO

Exception handling

PHP Java Scala Python
TODO 
TODO
 
TODO
 
TODO
 
TODO

Dealing with types

PHP Java Scala Python
TODO 
TODO
 
TODO
 
TODO
 
TODO

Classes, objects, methods, etc

PHP Java Scala Python
TODO 
TODO
 
TODO
 
TODO
 
TODO
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