write a program that calculates the frequency (occurance) of each element in an array.
Answers
Answer:
public class Frequency {
public static void main(String[] args) {
//Initialize array.
int [] arr = new int [] {1, 2, 8, 3, 2, 2, 2, 5, 1};
//Array fr will store frequencies of element.
int [] fr = new int [arr.length];
int visited = -1;
for(int i = 0; i < arr.length; i++){
Explanation:
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public class Frequency {
public static void main(String[] args) {
//Initialize array
int [] arr = new int [] {1, 2, 8, 3, 2, 2, 2, 5, 1};
//Array fr will store frequencies of element
int [] fr = new int [arr.length];
int visited = -1;
for(int i = 0; i < arr.length; i++){
int count = 1;
for(int j = i+1; j < arr.length; j++){
if(arr[i] == arr[j]){
count++;
//To avoid counting same element again
fr[j] = visited;
}
}
if(fr[i] != visited)
fr[i] = count;
}
//Displays the frequency of each element present in array
System.out.println("---------------------");
System.out.println(" Element | Frequency");
System.out.println("---------------------");
for(int i = 0; i < fr.length; i++){
if(fr[i] != visited)
System.out.println(" " + arr[i] + " | " + fr[i]);
}
System.out.println("---------------------");
}
}
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