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单选题 Suppose a Scanner object is created as follows, what method do you use to read a real number? Scanner input = new Scanner(System.in)
学科：Java程序设计-非计算机
时间：2023-06-18 05:09:11
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题目1单选题
What is the exact output of the following code? double area = 3.5; System.out.print("area"); System.out.print(area)A. 3.53.5B. 3.5 3.5C. area3.5D. area 3.5
题目2单选题
Suppose a Scanner object is created as follows, what method do you use to read a real number? Scanner input = new Scanner(System.in)A. input.nextDouble()B. input.nextdouble()C. input.double()D. input.Double()
题目3单选题
The following code fragment reads in two numbers: Scanner input = new Scanner(System.in); int i = input.nextInt(); double d = input.nextDouble(); What is the incorrect way to enter these two numbersA. Enter an integer, a space, a double value, and then the Enter keyB. Enter an integer, two spaces, a double value, and then the Enter keyC. Enter an integer, an Enter key, a double value, and then the Enter keyD. Enter a numeric value with a decimal point, a space, an integer, and then the Enter key
题目4单选题
If you enter 4 2 4, when you run this program, what will be the output? import java.util.Scanner; public class Test1 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter three numbers: "); double number1 = input.nextDouble(); double number2 = input.nextDouble(); double number3 = input.nextDouble(); // Compute average int average = (number1 + number2 + number3) / 4; // Display result System.out.println(average); } }A. 2.0B. 2.5C. 3.0D. 1.5
题目5单选题
Analyze the following code. public class Test { public static void main(String[] args) { int month = 09; System.out.println("month is " + month); } }A. The program displays month is 09B. The program displays month is 9C. The program displays month is 9.0D. The program has a syntax error, because 09 is an incorrect literal value
题目6单选题
What is the output of the following code: double x = 5.5; int y = (int)x; System.out.println("x is " + x + " and y is " + y)A. x is 5 and y is 6B. x is 6.0 and y is 6.0C. x is 6 and y is 6D. x is 5.5 and y is 5
题目7单选题
If you attempt to add an int, a byte, a long, and a double, the result will be a(n) __________ valueA. byteB. intC. longD. double
题目8单选题
Analyze the following code: public class Test { public static void main(String[] args) { int n = 10000 * 10000 * 10000; System.out.println("n is " + n); } }A. The program displays n is 1000000000000B. The result of 10000 * 10000 * 10000 is too large to be stored in an int variable n. This causes an overflow and the program is abortedC. The result of 10000 * 10000 * 10000 is too large to be stored in an int variable n. This causes an overflow and the program continues to execute because Java does not report errors on overflowD. The result of 10000 * 10000 * 10000 is too large to be stored in an int variable n. This causes an underflow and the program is abortedE. The result of 10000 * 10000 * 10000 is too large to be stored in an int variable n. This causes an underflow and the program continues to execute because Java does not report errors on underflow
题目9单选题
Analyze the following program fragment: int x; double d = 1.5; switch (d) { case 1.0: x = 1; case 1.5: x = 2; case 2.0: x = 3; }A. The program has a compile error because the required break statement is missing in the switch statementB. The program has a compile error because the required default case is missing in the switch statementC. The switch control variable cannot be doubleD. No errors
题目10单选题
What is y after the following statement is executed? x = 0; y = (x > 0) ? 10 : -10A. -10B. 0C. 10D. 20E. Illegal expression
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