Convert decimal number to rational: Difference between revisions
→{{header|Java}}
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=={{header|Java}}==
<syntaxhighlight lang="java">
double fractionToDecimal(String string) {
int indexOf = string.indexOf(' ');
int integer = 0;
int numerator, denominator;
if (indexOf != -1) {
integer = Integer.parseInt(string.substring(0, indexOf));
string = string.substring(indexOf + 1);
}
indexOf = string.indexOf('/');
numerator = Integer.parseInt(string.substring(0, indexOf));
denominator = Integer.parseInt(string.substring(indexOf + 1));
return integer + ((double) numerator / denominator);
}
String decimalToFraction(double value) {
String string = String.valueOf(value);
string = string.substring(string.indexOf('.') + 1);
int numerator = Integer.parseInt(string);
int denominator = (int) Math.pow(10, string.length());
int gcf = gcf(numerator, denominator);
if (gcf != 0) {
numerator /= gcf;
denominator /= gcf;
}
int integer = (int) value;
if (integer != 0)
return "%d %d/%d".formatted(integer, numerator, denominator);
return "%d/%d".formatted(numerator, denominator);
}
int gcf(int valueA, int valueB) {
if (valueB == 0) return valueA;
else return gcf(valueB, valueA % valueB);
}
</syntaxhighlight>
<pre>
67/74 = 0.9054054054054054
14/27 = 0.5185185185185185
0.9054054 = 4527027/5000000
0.518518 = 259259/500000
</pre>
<br />
<syntaxhighlight lang="java">import org.apache.commons.math3.fraction.BigFraction;
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