Conversion Formulas

Converting between international temperature scales:

• Celsius to Fahrenheit: F = (C × 9/5) + 32
• Fahrenheit to Celsius: C = (F - 32) × 5/9
• Celsius to Kelvin: K = C + 273.15

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Complete C Implementation

c (ISO Standard)
Run in Compiler.cCopy
#include <stdio.h>

double celsiusToFahrenheit(double c) {
    return (c * 9.0 / 5.0) + 32.0;
}

double fahrenheitToCelsius(double f) {
    return (f - 32.0) * 5.0 / 9.0;
}

double celsiusToKelvin(double c) {
    return c + 273.15;
}

int main() {
    double celsiusValues[] = {0.0, 25.0, 37.0, 100.0, -40.0};
    int count = sizeof(celsiusValues) / sizeof(celsiusValues[0]);

    printf("%-12s %-15s %-12s\n", "Celsius (°C)", "Fahrenheit (°F)", "Kelvin (K)");
    printf("---------------------------------------------\n");

    for (int i = 0; i < count; i++) {
        double c = celsiusValues[i];
        double f = celsiusToFahrenheit(c);
        double k = celsiusToKelvin(c);
        printf("%-12.2f %-15.2f %-12.2f\n", c, f, k);
    }

    return 0;
}

Sample Output

text (ISO Standard)
Copy
Celsius (°C) Fahrenheit (°F) Kelvin (K)  
---------------------------------------------
0.00         32.00           273.15      
25.00        77.00           298.15      
37.00        98.60           310.15      
100.00       212.00          373.15      
-40.00       -40.00          233.15      

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Complexity Analysis

• Time Complexity: O(1) direct arithmetic calculation.
• Space Complexity: O(1) zero memory allocation overhead.

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Related Programs

• Practice arithmetic logic in Simple Calculator in C.
• Review fundamental types in Data Types in C.