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<BR>圓周率小數(shù)點(diǎn)后1000位<BR><BR><BR>#include"math.h"<BR>main()<BR>{<BR>float
s;<BR>int b,x,n,c,i,j,d,l,a[5000];<BR>printf("\n
輸入精確位數(shù)");<BR>scanf("%d",&x);<BR>for(s=0,n=1;n<=5000;n++)<BR>{s=s+log((2*n+1)/n);<BR>if(s/log(10)>x)
break;}<BR>for(i=0;i<=x+1;i++)
a[i]=0;<BR>for(c=1,j=n;j>=1;j--)<BR>{d=2*j+1;<BR>for(i=0;i<=x;i++)<BR>{a[i]=c/d;c=(c%d)*10+a[i+1];}<BR>a[x+1]=c/d;<BR>for(b=0,i=x+1;i>=0;i--)<BR>{a[i]=a[i]*j+b;b=a[i]/10;a[i]=a[i]%10;}<BR>a[0]=a[0]+1;c=a[0];}<BR>for(b=0,i=x+1;i>=0;i--)<BR>{a[i]=a[i]*2+b;b=a[i]/10;a[i]=a[i]%10;}<BR>printf("\n
pi=%d.",a[0]);<BR>for(l=10,i=1;i<=x;i++)<BR>{printf("%d",a[i]);l++;<BR>if(l%10==0)printf("
");<BR>if(l%30==0)printf("\n");}<BR>}<BR><BR><BR><BR><BR> </TD>
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