double a=10;
double b=5;
double i = (a - b)/2;
System.out.println(i);输出:2.5int a=10;
int b=5;
double i =(double ) (a - b)/2;
System.out.println(i);输出:2.5
double a=10;
double b=5;
double i = (a - b)/2;
System.out.println(i);输出:2.5int a=10;
int b=5;
double i =(double ) (a - b)/2;
System.out.println(i);输出:2.5
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