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50 lines
916 B
50 lines
916 B
#include <stdio.h>
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#include <stdlib.h>
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double c2f(double celsius) {
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return ((9.0 / 5.0) * celsius) + 32.0;
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}
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double f2c(double fahrenheit) {
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return (5.0 / 9.0) * (fahrenheit - 32.0);
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}
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int die_usage(const char *msg) {
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printf("Usage: temperatures <temp>[fFcC]\n");
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printf("%s\n", msg);
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exit(1);
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}
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int main(int argc, char * argv[]) {
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if (argc < 2) {
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die_usage("");
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}
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char msg[255];
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double temp;
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char scale = '\0';
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const char * temp_string = argv[1];
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sscanf(temp_string, "%lf%c", &temp, &scale);
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switch (scale) {
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case 'c':
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case 'C':
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printf("%.2lf\n", c2f(temp));
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break;
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case 'f':
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case 'F':
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printf("%.2lf\n", f2c(temp));
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break;
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default:
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sprintf(msg, "Unknown scale '%c'", scale);
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die_usage(msg);
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break;
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}
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return 0;
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}
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