Ethiopian multiplication: Difference between revisions
Content added Content deleted
(Added Pascal) |
(→{{header|Java}}: I can;t believe it went that long with no one catching this error, added negative check to first version) |
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import java.util.Map; |
import java.util.Map; |
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import java.util.Scanner; |
import java.util.Scanner; |
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public class Mult |
public class Mult{ |
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public static void main(String[] args){ |
public static void main(String[] args){ |
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Scanner sc = new Scanner(System.in); |
Scanner sc = new Scanner(System.in); |
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int second = sc.nextInt(); |
int second = sc.nextInt(); |
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if(first < 0){ |
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| ⚫ | |||
first = -first; |
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second = -second; |
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} |
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| ⚫ | |||
columns.put(first, second); |
columns.put(first, second); |
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do{ |
do{ |
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first = |
first = halveInt(first); |
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second = |
second = doubleInt(second); |
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columns.put(first, second); |
columns.put(first, second); |
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}while(first != 1); |
}while(first != 1); |
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int sum = 0; |
int sum = 0; |
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for(Map.Entry |
for(Map.Entry<Integer, Integer> entry : columns.entrySet()){ |
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if(!isEven(entry.getKey())){ |
if(!isEven(entry.getKey())){ |
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sum += entry.getValue(); |
sum += entry.getValue(); |
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public static boolean isEven(int num){ |
public static boolean isEven(int num){ |
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return num & 1 == 0; |
return (num & 1) == 0; |
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} |
} |
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}</lang> |
}</lang> |
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/** |
/** |
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* This method is an improved version that will use |
* This method is an improved version that will use |
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* ethiopian styled multiplication, |
* ethiopian styled multiplication, and also |
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* |
* supports negative parameters. |
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* @param a Any integer. |
* @param a Any integer. |
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* @param b Any integer. |
* @param b Any integer. |
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