52 lines
1.2 KiB
C++
52 lines
1.2 KiB
C++
#include <math.h>
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#include<stdio.h>
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int main()
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{
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int x;
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while(scanf("%d",&x)!=EOF&&x){
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float s;
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int b,n,c,i,j,d,l,a[20000],sp;
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x*=5;
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s=0;n=1;
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while (s<=x+10){
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s=s+log10((2*n+1)/(1.0*n));
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n++;
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}
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for(i=0;i<=x+5;i++) a[i]=0;
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for(c=1,j=n;j>=1;j--){
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d=2*j+1;
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for(i=0;i<=x+4;i++){
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a[i]=c/d;
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c=(c%d)*10+a[i+1];
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}
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a[x+5]=c/d;
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for(b=0,i=x+5;i>=0;i--){
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a[i]=a[i]*j+b;
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b=a[i]/10;
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a[i]=a[i]%10;
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}
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a[0]=a[0]+1;c=a[0];
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}
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for(b=0,i=x+5;i>=0;i--){
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a[i]=a[i]*2+b;
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b=a[i]/10;
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a[i]=a[i]%10;
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}
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puts("3.");
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printf(" ");
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for(i=1,sp=0;i<=x;++i){
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printf("%d",a[i]);
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if(i%5==0) {
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sp+=1;
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if(i!=x&&(!sp||sp%10!=0)) printf(" ");
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}
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if(sp&&sp%10==0){
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sp=0;
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if(i!=x)puts("");
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if(i!=x) printf(" ");
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}
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}
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puts("");
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}
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}
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