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