C PROGRAMMING PROGRAM • SWITCH & MENU PROGRAMS

Convert a Digit to a Word Using switch

Learn how to convert a digit to a word using switch using a clear C program.

BeginnerswitchInteger casesInput validation

PROBLEM UNDERSTANDING

Input and expected output

Sample input

Sample output

Seven

COMPLETE C PROGRAM

Complete C implementation

#include <stdio.h>

int main(void)
{
    int digit;
    printf("Enter a digit: ");
    scanf("%d", &digit);
    switch (digit) {
        case 0: puts("Zero"); break; case 1: puts("One"); break;
        case 2: puts("Two"); break; case 3: puts("Three"); break;
        case 4: puts("Four"); break; case 5: puts("Five"); break;
        case 6: puts("Six"); break; case 7: puts("Seven"); break;
        case 8: puts("Eight"); break; case 9: puts("Nine"); break;
        default: puts("Input is not a single digit.");
    }
    return 0;
}

CURRENT STEP

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EXPECTED OUTPUT FOR THE SAMPLE

Seven

0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

Read the required input values.
Associate each integer digit with its word and reject values outside zero through nine.
Display the computed result.

Associate each integer digit with its word and reject values outside zero through nine.

EFFICIENCY

Time and space complexity

Time complexity

O(1)

Auxiliary space

O(1)

DEBUGGING CHECKLIST

Common mistakes

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Use the correct format specifier for every variable.

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Initialize variables before using their values.

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Check braces, semicolons and input order carefully.

Try it yourself

Practice: Run the program with the sample input, predict its output, and then test one boundary case of your own.