hacktoberfest2025/temperature_conversion at main · NoobCoderReturns/hacktoberfest2025 · GitHub

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// C program to print a Celsius–Fahrenheit
// temperature conversion table //
// F = (C × 9/5) + 32 //
// C = (F − 32) × 5/9 //

#include <stdio.h>

// Function to convert Celsius to Fahrenheit //
float celsiusToFahrenheit(float celsius)
{
    return (celsius * 9 / 5) + 32;
}

// Function to convert Fahrenheit to Celsius //
float fahrenheitToCelsius(float fahrenheit)
{
    return (fahrenheit - 32) * 5 / 9;
}

// Function to print table header //
void printHeader(char mode)
{
    if (mode == 'C')
    {
        printf("\n-------------------------------------\n");
        printf(" Celsius → Fahrenheit Conversion Table\n");
        printf("-------------------------------------\n");
        printf("   Celsius (°C)     Fahrenheit (°F)\n");
        printf("-------------------------------------\n");
    }
    else
    {
        printf("\n-------------------------------------\n");
        printf(" Fahrenheit → Celsius Conversion Table\n");
        printf("-------------------------------------\n");
        printf(" Fahrenheit (°F)     Celsius (°C)\n");
        printf("-------------------------------------\n");
    }
}

// Function to print conversion table //
void printConversionTable(float start, float end, float step, char mode)
{
    printHeader(mode);

    if (mode == 'C')
    {
        for (float c = start; c <= end; c += step)
        {
            printf("     %6.2f           %8.2f\n", c, celsiusToFahrenheit(c));
        }
    }
    else
    {
        for (float f = start; f <= end; f += step)
        {
            printf("     %6.2f           %8.2f\n", f, fahrenheitToCelsius(f));
        }
    }

    printf("-------------------------------------\n");
}

// Main function //
int main()
{
    char mode;
    float start, end, step;

    printf("Enter mode (C for Celsius to Fahrenheit, F for Fahrenheit to Celsius): ");
    scanf(" %c", &mode);

    printf("Enter start value: ");
    scanf("%f", &start);

    printf("Enter end value: ");
    scanf("%f", &end);

    printf("Enter step value: ");
    scanf("%f", &step);

    if (mode == 'C' || mode == 'c')
        printConversionTable(start, end, step, 'C');
    else if (mode == 'F' || mode == 'f')
        printConversionTable(start, end, step, 'F');
    else
        printf("Invalid mode selected.\n");

    return 0;
}