[英]Why is the null error showing in my program; Stringtokenizer to array
[英]Why is my arrays program showing null?
我和我的搭檔正在嘗試創建一個數組程序,該程序將數組的名和姓分開,並顯示血壓以及最大,最小,SD和AVG血壓。 這是我們的程序:
package arrays;
import java.util.*;
import java.io.*;
public class Arrays{
static Scanner input = new Scanner(System.in);
static double[] BP = {103, 111, 90, 72, 143, 144, 77, 88, 103};
static double max = BP[0];
static double min = BP[0];
static double sd=0;
static double avg=0;
static double squareDiff=0;
static double variance=0;
static double calculation=0;
static int i;
static String item;
static String[] pname= {"Jimmy Jones", "John Tod", "Tim Smith", "Mary Smith", "Sally Fields", "Smita Parval", "Sukhen Dey", "Jimmy Chang", "JoAnn Todler"};
static String pfnameArray [] = new String[pname.length];
static String plnameArray [] = new String[pname.length];
static String pfname="";
static String plname= "";
public static void Separate_names() {
for (int i = 0; i < pname.length; i++) {
if(pname[i].substring(i, i+1).equals(' ')) {
pfnameArray[i] = pname[i].substring(0, i);
plnameArray[i] = pname[i].substring(i+1, pname.length+1);
pfname = pfnameArray[i];
plnameArray[i]=plname;
}
}
}
public static void Data_Entry() {
for (int i = 0; i < BP.length; i++) {
for (int i = 0; i< BP.length; i++) {
if (BP[i] < min) min = BP[i];
}
for(int a=0; a<BP.length; a++){
calculation +=BP[a];
}
avg=calculation/BP.length;
for(int v=0; v<BP.length; v++){
squareDiff+= Math.pow((BP[v]-avg),2);
variance=squareDiff/BP.length;
}
{sd =Math.sqrt(variance);
}
}
public static void Print_Data(String [] fName, String [] lName) {
for( int l=0; l<BP.length; l++){
System.out.println(plnameArray[i] + " " + pfnameArray[i] + ", Blood Pressure: " + BP[l]);
}
System.out.println();
System.out.println("Max is " + max);
System.out.println("Min is " + min);
System.out.println ("Average is " + avg);
System.out.println("Standard Deviation:" + sd);
}}
對於名字和姓氏的輸出,它顯示為null。 我如何將數組分隔到不顯示空值的地方? 另外,SD的公式正確嗎? 我們將其與其他人進行了比較,得出了不同的數字。
像這樣使用split
:
pfnameArray[] = pname[i].split(" ");
pfnameArray[0]
將包含名字pfnameArray[1
]將包含激光名稱
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