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class jinzhi_lj {
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public static void main(String[] args) {
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int a = 15;
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int n = 0;
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int i=0;
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while (a > 0) {
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n = (int) (n + (a % 2) * Math.pow(10,i));
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a = a / 2;
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i=i+1;
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}
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System.out.print("十进制a转换二进制n为：" + n);
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}
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}
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