Getting the number of decimal places: Difference between revisions
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12.345556 has 14 decimals |
12.345556 has 14 decimals |
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1234500000000000060751116919315055127939946206157864960.000000 has 0 decimals</pre> |
1234500000000000060751116919315055127939946206157864960.000000 has 0 decimals</pre> |
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=={{header|C++}}== |
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{{trans|C}} |
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<lang cpp>#include <iomanip> |
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#include <iostream> |
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#include <sstream> |
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int findNumOfDec(double x) { |
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std::stringstream ss; |
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ss << std::fixed << std::setprecision(14) << x; |
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auto s = ss.str(); |
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auto pos = s.find('.'); |
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if (pos == std::string::npos) { |
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return 0; |
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} |
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auto tail = s.find_last_not_of('0'); |
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return tail - pos; |
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} |
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void test(double x) { |
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std::cout << x << " has " << findNumOfDec(x) << " decimals\n"; |
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} |
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int main() { |
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test(12.0); |
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test(12.345); |
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test(12.345555555555); |
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test(12.3450); |
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test(12.34555555555555555555); |
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test(1.2345e+54); |
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return 0; |
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}</lang> |
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{{out}} |
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<pre>12 has 0 decimals |
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12.345 has 3 decimals |
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12.3456 has 12 decimals |
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12.345 has 3 decimals |
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12.3456 has 14 decimals |
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1.2345e+54 has 0 decimals</pre> |
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=={{header|Go}}== |
=={{header|Go}}== |
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