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C Program: Convert Kilometers to Miles

Introduction

Distance conversion is a common application in everyday life and programming.
The kilometer (km) is a metric unit of distance, while the mile (mi) is commonly used in the United States and a few other countries.

The formula to convert kilometers to miles is:

miles=kilometers×0.621371miles = kilometers \times 0.621371miles=kilometers×0.621371

Where:

• 1 kilometer = 0.621371 miles

In this program, we take a distance in kilometers as input from the user and display its equivalent in miles.

C Program: Convert Kilometers to Miles

#include <stdio.h>   // Standard I/O header
 
int main() {
    float kilometers, miles;
 
    // Input from user
    printf("Enter distance in kilometers: ");
    scanf("%f", &kilometers);
 
    // Conversion formula
    miles = kilometers * 0.621371;
 
    // Output result
    printf("%.2f kilometers = %.2f miles\n", kilometers, miles);
 
    return 0; // Successful termination
}

 
OUTPUT 1 :
Enter distance in kilometers: 10
10.00 kilometers = 6.21 miles

OUTPUT 2 :
Enter distance in kilometers: 42.195
42.20 kilometers = 26.22 miles

Explanation :

1. float kilometers, miles;
   • Declares two floating-point variables to store distances.
2. scanf("%f", &kilometers);
   • Reads the distance in kilometers from the user.
3. Conversion Formula
   • miles = kilometers * 0.621371 converts kilometers to miles.
4. printf("%.2f kilometers = %.2f miles\n", kilometers, miles);
   • Prints the result with two decimal places.
5. return 0;
   • Exits the program successfully.