Write a program to input a string in uppercase and print the frequency of each character.
Example:
Input: COMPUTER HARDWARE
Output:
CHARACTERS FREQUENCY A 2 C 1 D 1 E 2 H 1 M 1 O 2 P 1 R 2 T 1 U 1 W 1
import java.io.*;
class Frequency {
String s;
int i, j, l, f;
void display() throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter a string in upper case:");
s = br.readLine();
l = s.length();
System.out.println("CHARACTERS FREQUENCY");
for (i = 65; i <= 90; i++) { // ASCII values for 'A' to 'Z'
f = 0;
for (j = 0; j < l; j++) {
if (s.charAt(j) == i) {
f++;
}
}
if (f > 0) {
System.out.println((char)i + "\t\t" + f);
}
}
}
public static void main(String[] args) throws IOException {
Frequency freq = new Frequency();
freq.display();
}
}
Variable Table
| Variable | Type | Description |
|---|---|---|
s |
String |
To store the input string. |
i |
int |
Loop variable for ASCII values from 65 ('A') to 90 ('Z'). |
j |
int |
Loop variable for iterating through the string. |
l |
int |
To store the length of the input string. |
f |
int |
To store the frequency of each character. |
This program counts and prints the frequency of each character in the input string, considering only uppercase letters.
First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.
Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.