Java Scanner.nextFloat方法代码示例

import java.util.Scanner; //导入方法依赖的package包/类
public static void scannerDemo1() {
	Scanner scan = new Scanner(System.in);
	// 从键盘接收数据
	int i = 0;
	float f = 0.0f;
	System.out.print("输入整数：");
	if (scan.hasNextInt()) {
		// 判断输入的是否是整数
		i = scan.nextInt();
		// 接收整数
		System.out.println("整数数据：" + i);
	} else {
		// 输入错误的信息
		System.out.println("输入的不是整数！");
	}
	System.out.print("输入小数：");
	if (scan.hasNextFloat()) {
		// 判断输入的是否是小数
		f = scan.nextFloat();
		// 接收小数
		System.out.println("小数数据：" + f);
	} else {
		// 输入错误的信息
		System.out.println("输入的不是小数！");
	}
}
 

import java.util.Scanner; //导入方法依赖的package包/类
public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    float[] salary = new float[10];
    
    for (int i = 0; i < salary.length; i++) {
        System.out.printf("Salário do %dº funcionário: R$ ", (i+1));
        salary[i] = input.nextFloat();
    }
    input.close();
    
    
    for (int i = 0; i < salary.length; i++) {
        if (salary[i] < 860.0F)
            salary[i] *= 1.10F;
        else if ((salary[i] > 860.0F) && (salary[i] < 1200.0F))
            salary[i] *= 1.07F;
        else
            salary[i] *= 1.05F;
    }
    
    for (int i = 0; i < salary.length; i++) {
        System.out.printf("\nSalário do %dº funcionário (reajuste): R$ %.2f", (i+1), salary[i]);
    }
    System.out.println("");
    
}
 

import java.util.Scanner; //导入方法依赖的package包/类
public static void main(String[] args) {
	// entrada = preco de custo + percentual
	// Seria o prompt do java script
	Scanner sc = new Scanner(System.in);
	System.out.println("Digite o preco custo:");
	double precoCusto = sc.nextDouble();
	System.out.println("Digite o percentual:");
	float percentual = sc.nextFloat();

	// processamento = valor de venda
	double valorVenda = (percentual / 100 * precoCusto) + precoCusto;
	// saida = valor da venda
	// Forma de arredondar um valor 
	valorVenda = Math.round(valorVenda);
	System.out.println("Valor de venda = " + valorVenda);
}
 

import java.util.Scanner; //导入方法依赖的package包/类
void CalcBisectionRoot()                                                                /*Function definition to calculating the root by the method of Bisection*/
{
	 double  interval1 = 0.0,interval2 = 0.0,root=0.0,k = 0;
	 Scanner s=new Scanner(System.in);
	
	   
	   System.out.println("Enter The Value Of interval1 :");        /*Taking the value from first interval of the function from user*/
	   interval1=s.nextFloat();
	   System.out.println("Enter The Value Of interval2 :");      /*Taking the value from second interval of the function from user*/		   
                                  interval2=s.nextFloat();
	   if((f(interval1)*f(interval2))<0)                                      /*Multiplication of the function of two interverals where the root lies between, must be less than zero*/
	   {
		   while(Math.abs(interval1-interval2)>EPSILON)       
		   {
			   root=(interval1+interval2)/2;         /*iterative formula of Bisection method*/
			   k=f(root);
			   if(f(interval1)*k>0)
				   interval1=root;
			   else
				   interval2=root;
		   }
		   System.out.println("The Calculated Root Is::"+root);      /*printing the desired root*/ 
	   }
	   else
		   System.out.println("No real roots on this interval. OPERATION ABORTED.");       /*print when  root doesn't found*/
}
 

import java.util.Scanner; //导入方法依赖的package包/类
/**
 * 根据成绩计算成绩等级.
 *
 * @param args 命令行参数
 */
public static void main(String[] args) { // |\longremark{自动生成main函数的小技巧：输入psvm然后按下tab键即可}|
	Scanner console = new Scanner(System.in);
	System.out.print("请输入成绩："); // |\longremark{在光标闪烁处输入成绩}|
	float grade = console.nextFloat();
	System.out.print("成绩" + grade + "的等级为：");
	if (grade >= 90) {
		System.out.println("优秀");
	} else if (grade >= 80) {
		System.out.println("良好");
	} else if (grade >= 70) {
		System.out.println("中等");
	} else if (grade >= 60) {
		System.out.println("及格");
	} else {
		System.out.println("不及格");
	}
}
 

import java.util.Scanner; //导入方法依赖的package包/类
public static void main(String[] args) {
  String gradeLevel = "";
  Scanner console = new Scanner(System.in);
  System.out.print("请输入成绩：");
  float grade = console.nextFloat();
  int level = (int)grade / 10; // 转换为整数
  switch(level) {
    case 10:
    case 9:
      gradeLevel = "优秀";
      break;
    case 8:
      gradeLevel = "良好";
      break;
    case 7:
      gradeLevel = "中等";
      break;
    case 6:
      gradeLevel = "及格";
      break;
    default:
      gradeLevel = "不及格";
  }

  System.out.println("输入成绩为：" + grade + "，成绩等级为：" + gradeLevel);
}
 

import java.util.Scanner; //导入方法依赖的package包/类
public static void main(String[] args) {
	//el nombre del scanner puede ser cualquiera
	Scanner pepe = new Scanner(System.in);

	//int se utiliza para enteros

	System.out.println("Ingrese un entero");
	int a = pepe.nextInt();
	//float se utiliza para numeros con coma
	System.out.println("Ingrese un numero con coma");
	float b = pepe.nextFloat();
	//String se utiliza para palabras
	System.out.println("Ingrese un string (palabra)");
	String s = pepe.nextLine();

	System.out.println("Vemos el contenido");
	System.out.println(a);
	System.out.println(b);
	System.out.println(s);

}
 

import java.util.Scanner; //导入方法依赖的package包/类
public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);     // initialize the input scanner
    Distinct foo = new Distinct();             // initialize the object instance
    System.out.println("Enter the number of values in the array: ");
    int nLen = scan.nextInt();
    System.out.println("Enter the array contents: ");
    float[] array = new float[nLen];
    for (int i = 0; i < nLen; i++) {
        array[i] = scan.nextFloat();
    }
    
    boolean bDist = foo.isDistinct(array);
    if (bDist) {
        System.out.println("The numbers in the array are distinct");
    }
    else {
        System.out.println("There are at least two numbers equal");
    }
}
 

import java.util.Scanner; //导入方法依赖的package包/类
public static void main(String[] args) {

		Session ses = null;			//creating the session object
		Emp em = null;				
		Transaction tx = null;		//creating transaction object
		Scanner sc=new Scanner(System.in);		//creating scanner for user input

		ses = HibernateUtil.getSession();			//get the cgf,factory,session
		
			em = new Emp();		//creating the domain class object
			System.out.print("\n\t\tEnter the Account Holder Name: ");
			String name=sc.nextLine();
			System.out.print("\n\t\tEnter the Account Type: ");
			String type=sc.nextLine();
			System.out.print("\n\t\tEnter the Account Holder Balance: ");
			float bal=sc.nextFloat();
				
				em.setHoldername(name);
				em.setAcctype(type);
				em.setBalance(bal);
		try {
			tx = ses.beginTransaction();
			ses.save(em);
			tx.commit();
			System.out.println("object is saved  with account number: "+em.getAccno());
			//System.out.print("\n\t\tEnter the Account Holder Name: ");
		} catch (Exception e) {
			tx.rollback();

		}
		HibernateUtil.closeSession(ses);
    HibernateUtil.closeFactory();

		System.out.print("\n\t\t ==PROGRAMME BY PRATIK DIMBLE==\n\n\n");

	}
 

import java.util.Scanner; //导入方法依赖的package包/类
public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    final int TAM = 10;
    String name[] = new String[TAM];
    float bi1[] = new float[TAM];
    float bi2[] = new float[TAM];
    float average[] = new float[TAM];
    
    for (int i = 0; i < TAM; i++) {
        System.out.printf("Nome do %dº aluno: ", (i+1));
        name[i] = input.next();
        System.out.print("Nota do 1º bimestre: ");
        bi1[i] = input.nextFloat();
        System.out.print("Nota do 2º bimestre: ");
        bi2[i] = input.nextFloat();
        System.out.println("");
    }
    input.close();
    
    for (int i = 0; i < TAM; i++) {
        average[i] = bi1[i] * 0.4F + bi2[i] * 0.6F;
    }
    
    for (int i = 0; i < TAM; i++) {
        System.out.printf("%s: %s\n", name[i],
                average[i] >= 6.0 ? "APROVADO" : "REPROVADO");
    }
}
 

import java.util.Scanner; //导入方法依赖的package包/类
public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    float array[] = new float[10];
    float average = 0.0F;
    
    for (int i = 0; i < array.length; i++) {
        System.out.printf("%dº número real: ", (i+1));
        array[i] = input.nextFloat();
        average += array[i];
    }
    input.close();
    average /= array.length;
    
    System.out.printf("\nMédia Simples: %.1f\n", average);
}
 

import java.util.Scanner; //导入方法依赖的package包/类
public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    final int TAM = 10;
    float array1[] = new float[TAM];
    float array2[] = new float[TAM];
    float array3[] = new float[TAM];
    
    System.out.println("1º vetor");
    for (int i = 0; i < TAM; i++) {
        System.out.printf("%dº valor: ", (i+1));
        array1[i] = input.nextFloat();
    }
    
    System.out.println("2º vetor");
    for (int i = 0; i < TAM; i++) {
        System.out.printf("%dº valor: ", (i+1));
        array2[i] = input.nextFloat();
    }
    input.close();
    
    for (int i = 0; i < TAM; i++) {
        array3[i] = array1[i] * array2[i];
    }
    
    for (int i = 0; i < TAM; i++) {
        System.out.printf("\narray3[%d] = %.2f\n", i, array3[i]);
    }
}
 

import java.util.Scanner; //导入方法依赖的package包/类
/**
 * Stores the user input
 * @param i index to be passed to parser
 * @param cache line of code from main loop
 * @throws NumberFormatException
 * @throws SoupVariableException
 * @throws SoupSyntaxException 
 */
public static void soupStoreUserIn(int i, String cache) throws NumberFormatException, SoupVariableException, SoupSyntaxException {
	ns = Parser.parse(i, cache);
	
	HTMLGen.questionStrings.add(ns.get(0));
	List<String> validation = new ArrayList<String>();
	for (int e = 1; e < ns.size(); e++) {
		validation.add(ns.get(e));
	}
	Validator.validateNumbers(validation);
	
	if (!lockIndex)
	index = Parser.inx;
	
	System.out.println(ns.get(0));
	Scanner s = new Scanner(System.in);
	
	if (s.hasNextFloat()) {
		lastResult = s.nextFloat();
		VariableHandler.insertVar(lastResult, Integer.parseInt(ns.get(1)));
	}
	
	else {
		switch (s.nextLine()) {
		case "`" :
			VariableHandler.insertVar(1, 100);
			break;
		case "." :
			VariableHandler.insertVar(1, 101);
			break;
		}
	}
}
 

import java.util.Scanner; //导入方法依赖的package包/类
/**
 * main函数是Java程序的执行入口，这一点和C语言很相似.
 *
 * @param args 命令行参数，和C语言的argv也很相似
 */
public static void main(String[] args) {
	Scanner console = new Scanner(System.in);
	System.out.print("请输入半径：");// |\longremark{print函数只输出内容，不会自动换行}|
	float radius = console.nextFloat();
	double area = PAI * radius * radius; // |\longremark{表达式的最终类型是double，和C语言的类型转换规则是相同的}|
	System.out.println("面积=" + area); // |\longremark{println输出内容后自动换行。请思考如何使得输出结果只精确到小数点后3位？ }|
}
 

import java.util.Scanner; //导入方法依赖的package包/类
public static void main(String[] args) {
  float grade = 0; //  百分制成绩
  Scanner console = new Scanner(System.in);
  System.out.print("请输入成绩：");
  grade = console.nextFloat();
  while(grade >= 0) {
    showGrade(grade);
    grade = console.nextFloat();
  }
}