Convert Number to Words in C, C++, Java & Python – Code with Explanation & Examples in Short and Simple

   

C Program

#include <stdio.h>
int main() {
    int n; scanf("%d", &n);
    int r[10], i = 0;
    while (n) r[i++] = n % 10, n /= 10;
    for (int j = i-1; j >= 0; j++) {
        switch(r[j]) {
            case 0: printf("Zero "); break;
            case 1: printf("One "); break;
            case 2: printf("Two "); break;
            case 3: printf("Three "); break;
            case 4: printf("Four "); break;
            case 5: printf("Five "); break;
            case 6: printf("Six "); break;
            case 7: printf("Seven "); break;
            case 8: printf("Eight "); break;
            case 9: printf("Nine "); break;
        }
    }
}

C Output

Input:
501
Output:
Five Zero One

C++ Program

#include <iostream>

using namespace std;

string w[] = {"Zero","One","Two","Three","Four","Five","Six","Seven","Eight","Nine"};

int main() {

    string n; cin >> n;

    for (char c : n) cout << w[c - '0'] << " ";

}

C++ Output

Input:
2048
Output:
Two Zero Four Eight

JAVA Program

import java.util.*;
public class Main {
    public static void main(String[] a) {
        String[] w = {"Zero","One","Two","Three","Four","Five","Six","Seven","Eight","Nine"};
        String n = new Scanner(System.in).next();
        for (char c : n.toCharArray()) System.out.print(w[c - '0'] + " ");
    }
}

JAVA Output

Input:
79
Output:
Seven Nine

Python Program

w = ["Zero","One","Two","Three","Four","Five","Six","Seven","Eight","Nine"]
print(*[w[int(d)] for d in input()])

Python Output

Input:
835
Output:
Eight Three Five

In-Depth Explanation

Example

If the number is 501, then digit by digit it is converted to:

5 → Five

0 → Zero

1 → One

Thus the result is: Five Zero One

Each digit is converted individually and printed out with a space between them. This is not converting into full sentence words such as "Five hundred one" — it converts digit-by-digit which is very frequently needed for educational, banking, or form-based systems.

Real-Life Analogy

You’ve likely heard automated voice systems or exam readouts:

"Your roll number is. Five Zero One"

That's exactly the use case here. The system reads the number digit by digit so it can’t be misinterpreted. You’ll also see this in ATMs, OTP generators, phone verification, and shipping barcodes.

Why It Matters

Digit-to-word conversion is essential in:

Voice assistants

Accessibility tools for the visually impaired

Educational apps

Speech generation from numerical data

Audio OTP systems

This also fortifies string parsing, indexing, character-to-integer mapping, and control logic basics.

Learning Insights

You will learn how to:

Transform digits from characters to indexes (c - '0')

Map indexes to word arrays

Employ string and loop control to create custom output

Escape advanced logic using arrays and indexing cleverly

This is a tidy way to reinforce fundamentals while tackling an actual real-world micro-problem.

Interview & Project Relevance

This is the kind of problem typically posed in entry-level interviews to try:

String and number manipulation

Control structures (switch/case, loops)

Indexing proficiency

Precision of output formatting

Applications in real life involve:

IVR systems

Result announcers

Number-to-speech converters

Utility bill displays

Converting digits to word-form digit by digit is a very applied programming problem employed in education, sound equipment, and number-reading software. This problem is a building block to more advanced problems such as check writing applications or text-to-speech software. The solutions of C, C++, Java, and Python presented above are the most concise and tidy and are within the reach of beginners and intermediate learners.