我有一個字符串數組 - name[]。當我嘗試使用 Scanner 類從用戶那里獲取輸入時，程序似乎忽略了該語句并繼續下一個。import java.util.Scanner;class Student { //start of class public static void main(String[] args) { //start of method main Scanner sc = new Scanner(System.in); System.out.print("Enter number of students: "); int n = sc.nextInt(); String name[] = new String[n]; int totalmarks[] = new int[n]; for (int i = 0; i < n; i++) { System.out.println("Student " + (i + 1)); System.out.print("Enter name: "); name[i] = sc.nextLine(); System.out.print("Enter marks: "); totalmarks[i] = sc.nextInt(); } int sum = 0; for (int i = 0; i < n; i++) { sum = sum + totalmarks[i]; //calculating total marks } double average = (double) sum / n; System.out.println("Average is " + average); for (int i = 0; i < n; i++) { double deviation = totalmarks[i] - average; System.out.println("Deviation of " + name[i] + " is " + deviation); } } //end of method main} //end of class
2 回答
喵喵時光機
TA貢獻1846條經驗 獲得超7個贊
那是因為該sc.nextInt()方法不會讀取您輸入中的換行符，因此您需要調用sc.nextLine()
從文檔
將此掃描器前進到當前行并返回被跳過的輸入。
此方法返回當前行的其余部分，不包括末尾的任何行分隔符。位置設置為下一行的開頭。
由于此方法繼續搜索輸入以查找行分隔符，因此如果不存在行分隔符，它可能會緩沖所有搜索要跳過的行的輸入。
您的代碼現在看起來像：
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter number of students: ");
int n = sc.nextInt();
sc.nextLine(); // <----- observe this
String name[] = new String[n];
int totalmarks[] = new int[n];
for (int i = 0; i < n; i++) {
System.out.println("Student " + (i + 1));
System.out.print("Enter name: ");
name[i] = sc.nextLine();
System.out.print("Enter marks: ");
totalmarks[i] = sc.nextInt();
sc.nextLine(); // <----- observe this
}
int sum = 0;
for (int i = 0; i < n; i++) {
sum = sum + totalmarks[i];
}
double average = (double) sum / n;
System.out.println("Average is " + average);
for (int i = 0; i < n; i++) {
double deviation = totalmarks[i] - average;
System.out.println("Deviation of " + name[i] + " is " + deviation);
}
}
慕村9548890
TA貢獻1884條經驗 獲得超4個贊
試試這個..你的 sc.nextLine() 在你輸入整數值后讀取空字符串
import java.util.Scanner;
class Student
{//start of class
public static void main(String[] args)
{//start of method main
Scanner sc = new Scanner(System.in);
System.out.print("Enter number of students: ");
int n = sc.nextInt();
String emp = sc.nextLine();
String name[] = new String[n];
int totalmarks[] = new int[n];
for (int i=0;i<n;i++)
{
System.out.println("Student " + (i + 1));
System.out.print("Enter name: ");
name[i] = sc.nextLine();
System.out.print("Enter marks: ");
totalmarks[i] = sc.nextInt();
emp = sc.nextLine();
}
int sum = 0;
for (int i = 0; i < n; i++)
{
sum = sum + totalmarks[i];//calculating total marks
}
double average = (double) sum / n;
System.out.println("Average is " + average);
for (int i = 0; i < n; i++)
{
double deviation = totalmarks[i] - average;
System.out.println("Deviation of " + name[i] + " is " + deviation);
}
}//end of method main
}//end of class
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