//用for循环计算pi double pi = 0; double ffdz = 1.0; for (double i=3; i<=10000000; i+=2) {
pi += ffdz / i; ffdz = -ffdz; }
System.out.println((1-pi)*4);
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//用for循环计算pi
double pi = 0;
double ffdz = 1.0;
for (double i=3; i<=10000000; i+=2) {
pi += ffdz / i;
ffdz = -ffdz;
}
System.out.println((1-pi)*4);