double pi = 0;
double a=1.0;
for (double i=1.0;i<=500000000;i=i+2) {
pi=pi+a/i;
a=-a;
}
pi=pi*4;
System.out.println(pi);
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净净一隅
double pi = 0;
double a=1.0;
for (double i=1.0;i<=500000000;i=i+2) {
pi=pi+a/i;
a=-a;
}
pi=pi*4;
System.out.println(pi);