String Handling — Question 20
Back to all questionsQuestion 7
Write a program to input a string in uppercase and print the frequency of each character.
Sample Input : COMPUTER HARDWARE
Sample Output
Character Frequency
A 2
C 1
D 1
E 2
H 1
M 1
0 1
p 1
R 1
import java.util.Scanner;
public class KboatLetterFreq
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("Enter a sentence:");
String str = in.nextLine();
str = str.toUpperCase();
int freqMap[] = new int[26];
int len = str.length();
for (int i = 0; i < len; i++) {
char ch = str.charAt(i);
if (Character.isLetter(ch)) {
int chIdx = ch - 65;
freqMap[chIdx]++;
}
}
System.out.println("Character\tFrequency");
for (int i = 0; i < freqMap.length; i++) {
if (freqMap[i] > 0) {
System.out.println((char)(i + 65)
+ "\t\t" + freqMap[i]);
}
}
}
}Output
Key Concepts Covered
This question tests your understanding of the following concepts from the chapter String Handling: Question, Program, Input, String, Uppercase, Print. These are fundamental topics in Computer Applications that students are expected to master as part of the ICSE Class 10 curriculum.
A thorough understanding of these concepts will help you answer similar questions confidently in your ICSE examinations. These topics are frequently tested in both objective and subjective sections of Computer Applications papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This Question
Read the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to Remember
- Write programs with proper indentation and comments.
- Trace through your code with sample inputs to verify correctness.
- Explain the logic behind each step of your solution.
- Familiarise yourself with common library functions and methods.
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