求PI的近似值,用公式PI/4=1-1/3+1/5-1/7+...
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#include <stdio.h>
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#include <math.h>
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#include <conio.h>
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void main()
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{
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clrscr();
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int f=1;
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float pi=0,t=1,v=1;
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while (fabs(t)>1e-6)
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{
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pi=pi+t;
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v+=2; /*准备下一个累加的数据*/
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f=-f;
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t=f/v;
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}
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pi*=4;
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printf("\n pi=%10.8f",pi);
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}
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