英文:
How do I change the type of number? Double to int
问题
以下是您要求的代码部分翻译：
public class PaintEstimator {
public static void main(String[] args) {
// 创建 Scanner 对象 scnr
Scanner scnr = new Scanner(System.in);
// 声明标识符
double wallHeight;
double wallWidth;
double wallAera;
double gallonPaint = 350;
int paintNeeded;
// 提示用户输入墙的高度和宽度，并显示它们
System.out.println("输入墙的高度（英尺）：");
wallHeight = scnr.nextDouble();
System.out.println("输入墙的宽度（英尺）：");
wallWidth = scnr.nextDouble();
System.out.println("墙的高度为：" + wallHeight + "，墙的宽度为：" + wallWidth);
// 计算并输出墙的面积
wallAera = wallHeight * wallWidth;
System.out.println("墙的面积：" + wallAera + " 平方英尺");
// 计算并输出涂漆墙面所需的油漆量（以加仑为单位）
System.out.println("所需油漆量：" + (wallAera / gallonPaint) + " 加仑");
// 计算并输出用于涂漆的 1 加仑油漆桶的数量，四舍五入至最接近的整数
System.out.println("所需油漆桶数量：" + Math.ceil(wallAera / gallonPaint) + " 桶");
// 计算并输出涂漆墙壁的成本。
double costPaint = Math.ceil(wallAera / gallonPaint) * 45.0;
System.out.println("涂漆墙壁的成本：$" + costPaint);
}
}
英文:
When I run this program, I need the part where it says example " cans needed 3.0" I need it to only say the integer.
public class PaintEstimator {
public static void main(String[] args) {
// Create the Scanner object scnr
Scanner scnr = new Scanner(System.in);
// Declare the identifiers
double wallHeight;
double wallWidth;
double wallAera;
double gallonPaint = 350;
int paintNeeded;
// Prompt user for and input wall's height and width; and then display them
System.out.println("Enter wall height (feet) :");
wallHeight = scnr.nextInt();
System.out.println("Enter wall width (feet) :");
wallWidth = scnr.nextInt();
System.out.println("Wall height is: " + wallHeight + " and Wall width is: " + wallWidth);
// Calculate and output wall area
wallAera = wallHeight * wallWidth;
System.out.println("Wall area: " + wallAera + "square feet");
// Calculate and output the amount of paint in gallons needed to paint the wall
System.out.println("Paint needed: " + (wallAera / gallonPaint) + " gallons");
// Calculate and output the number of 1 gallon cans needed to paint the wall, rounded up to nearest integer
System.out.println("Cans needed: " + Math.ceil(wallAera / gallonPaint) + " can ( s )");
// Calculate and output the cost of painting the wall.
double costPaint = Math.ceil(wallAera / gallonPaint) * 45.0;
System.out.println("Cost to paint the wall: $" + costPaint);
}
}
答案1
得分: 1
你可以像你已经在做的那样四舍五入/向上取整，然后将其转换为整数：
System.out.println("需要的油漆桶数：" + (int) Math.ceil(wallAera / gallonPaint) + " 桶");
英文:
You can round/ceil it up, as you are already doing, and then cast it to an int:
System.out.println("Cans needed: " + (int) Math.ceil(wallAera / gallonPaint) + " can ( s )");
答案2
得分: 0
以下是翻译好的内容：
有三种基本方法可以将双精度数转换为整数。
其中 var-name 是整数，var-name1 是双精度数。
方法1：类型转换
示例：
int var-name = (int) var-name1;
方法2：四舍五入
示例：
int var-name = Math.round(var-name1);
方法3：Double.intValue
示例：
int var-name = Double.intValue(var-name1);
英文:
There are 3 basic methods for change a double to an integer.
Where var-name is an integer and var-name1 is a double.
Method 1: Type-casting
Example:
int var-name = (int) var-name1;
Method 2: Rounding
Example:
int var-name = Math.round(var-name1);
Method 3: Double.intValue
Example:
int var-name = Double.intValue(var-name1);
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