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55 lines
1.0 KiB
55 lines
1.0 KiB
#include <stdio.h>
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#include <limits.h>
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#include <math.h>
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#include <stdbool.h>
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double getNumber(char * s);
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void calcTemperatures(double fahrenheit);
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int main(void) {
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double fahrenheit;
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printf("This program calculates Celsius & Kelvin from Fahrenheit.\n");
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fahrenheit = getNumber("Now enter the temp in Fahrenheit: ");
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while (!isnan(fahrenheit)) {
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calcTemperatures(fahrenheit);
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fahrenheit = getNumber("Now enter the first operand (q to quit): ");
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};
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return 0;
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}
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double getNumber(char * s) {
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double number;
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printf("%s", s);
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if (!scanf("%lf", &number) || isnan(number)) {
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number = NAN;
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}
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return number;
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}
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void calcTemperatures(double fahrenheit) {
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const float celsius_div = 5.0 / 9.0;
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const float celsius_offset = 32.0;
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const float kelvin_offset = 273.16;
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const double celsius = celsius_div *(fahrenheit - celsius_offset);
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const double kelvin = celsius + kelvin_offset;
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printf("%.2lf Fahrenheit are %.2lf Celsius or %.2lf Kelvin.\n", fahrenheit, celsius, kelvin);
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}
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