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#include <stdio.h>
#include <stdlib.h>
#include <errno.h> // for errno
#include <limits.h> // for INT_MAX, INT_MIN
/*
F = C x 9/5 + 32
*/
int
main(int argc, char *argv[])
{
if (argc < 2) {
printf("Usage: %s number\n", argv[0]);
return 1;
}
char *endptr;
errno = 0; // reset errno
long value = strtol(argv[1], &endptr, 10); // base 10
if (endptr == argv[1]) {
printf("Error: No digits were found\n");
return 1;
}
if (*endptr != '\0') {
printf("Warning: Trailing characters after number: %s\n", endptr);
return 1;
}
if ((value == LONG_MAX || value == LONG_MIN) && errno == ERANGE) {
printf("Error: Number out of range\n");
return 1;
}
float fah = value * 9/5 + 32;
printf("Fahrenheit: %0.f\n", fah);
return 0;
}
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