Conversion some physical quantity

[maddeshiyashushil01-beep]

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#include <stdio.h>

int main() {
    float first, second;
    char input;

    // Conversion factors
    float kmsToMiles = 0.621371;
    float inchesToFoot = 0.0833333;
    float inchesTocm=2.54;
    float kmTom=1000;

    while (1) {
        printf("\nEnter the input character. q to quit\n");
        printf("1. kms to miles\n");
        printf("2. inches to foot\n");
        printf("3. inches to cm\n");
        printf("4. km to m\n");
        scanf(" %c", &input);   // Note: space before %c to handle newline

        switch (input) {
            case 'q':
                printf("Quitting the program...\n");
                return 0;

            case '1':
                printf("Enter quantity in kms: ");
                scanf("%f", &first);
                second = first * kmsToMiles;
                printf("%f Kms is equal to %f Miles\n", first, second);
                break;

            case '2':
                printf("Enter quantity in inches: ");
                scanf("%f", &first);
                second = first * inchesToFoot;
                printf("%f Inches is equal to %f Foot\n", first, second);
                break;
                
                
            case '3':
                printf("Enter quantity in inches: ");
                scanf("%f", &first);
                second = first * inchesTocm;
                printf("%f Inches is equal to %f cm\n", first, second);
                break;
                
                
            case '4':
                printf("Enter quantity in km: ");
                scanf("%f", &first);
                second = first * kmTom;
                printf("%f km is equal to %f m\n", first, second);
                break;

            default:
                printf("Invalid input, try again!\n");
        }
    }

    return 0;
}