java - 在 For 循环中使用计数器？

Question

如何在此 for 循环中正确部署 gradecount 计数器？

它应该在每个等级输入后递增。

for (int i = 0; i < numOfGrades; i++){
    double belowzero = gradeinput.nextDouble();
    int gradecount = 1;
    System.out.println("enter grade number " + gradecount + ":" );
    gradecount++;

    while (belowzero < 0){
        belowzero = gradeinput.nextDouble();
    }
    grades[i] = belowzero;
}
}

Answer 1

在 for 循环外初始化 gradecount。

int gradecount = 1;
for (int i = 0; i < numOfGrades; i++){
    double belowzero = gradeinput.nextDouble();

    System.out.println("enter grade number " + gradecount + ":" );
    gradecount++;

    while (belowzero < 0){
        belowzero = gradeinput.nextDouble();
    }
    grades[i] = belowzero;
}
}