简要介绍程序的下载调试过程。

以下哪条语句表示“如果radius为正,则显示圆的面积”?

A. if (radius != 0) System.out.println(radius * radius * 3.14);
B. if (radius >= 0) System.out.println(radius * radius * 3.14);
C. if (radius > 0) System.out.println(radius * radius * 3.14);
D. if (radius <= 0) System.out.println(radius * radius * 3.14);

假设income的值为4001,下面代码的输出是_________if (income > 3000) { System.out.println("Income is greater than 3000"); } else if (income > 4000) { System.out.println("Income is greater than 4000"); }

A. Income is greater than 3000
B. Income is greater than 3000 followed by Income is greater than 4000
C. Income is greater than 4000
D. Income is greater than 4000 followed by Income is greater than 3000

以下代码的输出是_________?double temperature = 50; if (temperature >= 100) System.out.println("too hot"); else if (temperature <= 40) System.out.println("too cold"); else System.out.println("just right");

A. too hot
B. too cold
C. just right
D. too hot too cold just right

假设x=1,y=-1,z=1。以下语句的输出是_________?(请先正确缩进语句。) if (x > 0) if (y > 0) System.out.println("x > 0 and y > 0"); else if (z > 0) System.out.println("x < 0 and z > 0");

A. x > 0 and y > 0;
B. x < 0 and z > 0;
C. x < 0 and z < 0;
D. no output.

以下代码的输出是什么? int x = 0; while (x < 4) { x = x + 1; } System.out.println("x is " + x);

A. x is 0
B. x is 1
C. x is 3
D. x is 4

以下代码的输出结果是_________? int number = 6; while (number > 0) { number -= 3; System.out.print(number + " "); }

A. 60
B. 63
C. 30
D. 3 0 -3

执行以下循环后,count的值是_________? int count = 0; do { System.out.println("Welcome to Java"); } while (count++ < 9); System.out.println(count);

A. 8
B. 9
C. 10
D. 11

执行下面的语句后，a、b、c的值分别是()() ()int a = 2 ;int b = (a++) * 3 ;int c = (++a) * 3 ;

下面的if-else语句，使用条件运算符可写为（）if(age>16)price=20;elseprice=10;