Question

怎样用计算机计算π不是计算器,要能算到小数点后任意多位的,越多越好

Answer 1

const ARRSIZE=1010,DISPCNT=1000; //定义数组大小,显示位数

char x[ARRSIZE],z[ARRSIZE]; //x[0] x[1] .x[2] x[3] x[4] .x[ARRSIZE-1]

int a=1,b=3,c,d,Run=1,Cnt=0;

memset(x,0,ARRSIZE);

memset(z,0,ARRSIZE);

x[1] = 2;

z[1] = 2;

while(Run && (++Cnt0; i--)

{

c = z[i]*a + d;

z[i] = c % 10;

d = c / 10;

}

//z/=b;

d = 0;

for(int i=0; i0; i--)

{

c = x[i] + z[i];

x[i] = c%10;

x[i-1] += c/10;

Run |= z[i];

}

a++;

b+=2;

}

Memo1->Text = AnsiString().sprintf("计算了 %d 次rn",Cnt);

Memo1->Text = Memo1->Text + AnsiString().sprintf("Pi=%d%d.rn",x[0],x[1]);

for(int i=0; iText = Memo1->Text + "rn";

Memo1->Text = Memo1->Text + (int)x[i+2];

}