解题思路:
注意事项:
参考代码:
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner=new Scanner(System.in);
int n=scanner.nextInt();
double sum=0;
while(n!=0) {
String str=scanner.next();
double a=scanner.nextDouble();
double b=scanner.nextDouble();
sum+=a*b;
n--;
}
System.out.printf("%6f",sum);
}
}
0.0分
0 人评分