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#include<iostream>
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using namespace std;
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//功能：将一个十进制数转化为二进制数
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void bin2(int n) {
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int i,j=0;
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int a[1000];
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i=n;
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if(i==0) {
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cout<<"0"<<endl;
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}
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while(i) {
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a[j]=i%2;
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i/=2;
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j++;
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}
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for(i=j-1; i>=0; i--)
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cout<<a[i];
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cout<<endl;
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}
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int main() {
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bin2(12);
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return 0;
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}
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