C语言程序设计，用级数计算圆周率π

#includeint main(){ double pi=2.0; double i=1.0; double a= i; double b= 2*i+1; double t=2*a/b; while(t>=1e-100) { pi = pi + t; i=i+1; a=a*i; b=b*(2*i+1); t=2*a/b; } printf("%g&#