public static void main(String[] args) {
double sum = 0;
for(double i=1,y=1;;i+=2,y*=-1){
sum = sum+(y/i);
System.out.println(sum*4);
}
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よろしく
public static void main(String[] args) {
double sum = 0;
for(double i=1,y=1;;i+=2,y*=-1){
sum = sum+(y/i);
System.out.println(sum*4);
}
}