temperature_converter.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// Functions
    // Clear Screen
void reset(int a)
{
    system("cls");
    if (a > 0) printf("\n\n");
}

    // Wait for enter and clear buffer if there is something left
void get_n()
{
    char chr;
    while ((chr = getchar()) != '\n');
}

    // Quit
void quit()
{
    printf("\n\tPress Enter to Exit...");
    get_n();
    reset(0);
    exit(0);
}

int main ()
{
    int ch;
    float cl, fh;
    char temp, ans;

    reset(1);
    printf("\tProgram to convert celcius to fahrenheit and vice versa.\n");
    printf("\n\tPress Enter to Continue...");
    get_n();

    start: ;
    ch = 0; cl = '\0'; fh = '\0'; temp = '\0'; ans = '\0';
    reset(1);
    printf("\tTemperature Converter\n");
    printf("\n\t----------- ---------\n");
    printf("\n\t[1]: Celcius to Fahrenheit.");
    printf("\n\t[2]: Fahrenheit to Celcius.");
    printf("\n\t[X]: Quit");
    printf("\n\n\t > ");
    if(scanf(" %d%c", &ch, &temp) == 2 && temp == '\n') {
        switch (ch) {
            case 1:
                celcius: ;
                reset(1);
                printf("\n\tEnter temperature in Celsius: ");
                if(scanf(" %f%c", &cl, &temp) == 2 && temp == '\n') {
                    fh = (cl * 1.8) + 32;
                    printf("\n\tTemperature in Fahrenheit: %.2f", fh);
                    printf("\n\n\tPress Enter to Repeat...");
                    get_n();
                    goto start;
                } else {
                    get_n();
                    printf("\n\tWrong Format! Try Again? [Y/n]: ");
                    if (scanf(" %c", &ans) == 1 && (ans == 'Y' || ans == 'y')) {
                        goto celcius;
                    } else {
                        get_n();
                        goto start;
                    }
                    get_n();
                }
                break;
            case 2:
                fahrenheit: ;
                reset(1);
                printf("\n\tEnter temperature in Fahrenheit: ");
                if(scanf(" %f%c", &fh, &temp) == 2 && temp == '\n') {
                    cl= (fh - 32) / 1.8;
                    printf("\n\tTemperature in Celsius: %.2f",cl);
                    printf("\n\n\tPress Enter to Repeat...");
                    get_n();
                    goto start;
                } else {
                    get_n();
                    printf("\n\tWrong Format! Try Again? [Y/n]: ");
                    if (scanf(" %c", &ans) == 1 && (ans == 'Y' || ans == 'y')) {
                        goto fahrenheit;
                    } else {
                        get_n();
                        goto start;
                    }
                    get_n();
                }
                break;
            default:
                quit();
                break;
        }
    } else {
        get_n();
        quit();
    }

    return 0;
}