jackbenny/subnetcalc
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This commit is contained in:
Jack-Benny Persson 2020-09-13 00:17:12 +02:00
parent c03cc73acf
commit 41a934985a
2 changed files with 11 additions and 11 deletions
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2
Makefile
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@ -1,5 +1,5 @@
subnetcalc: subnetcalc.c subnetcalc: subnetcalc.c
gcc -Wall -pedantic subnetcalc.c -lm -o subnetcalc gcc -std=c99 -Wall -pedantic subnetcalc.c -lm -o subnetcalc
clean: subnetcalc clean: subnetcalc
rm subnetcalc rm subnetcalc

20
subnetcalc.c
View File

@ -9,26 +9,26 @@
int main(void) int main(void)
{ {
int net; int net;
double hosts; long int hosts, addr;
double addr;
printf("Enter netmask in slash-notation without the slash: "); printf("Enter netmask in slash-notation without the slash: ");
scanf("%2d", &net); scanf("%2d", &net);
if (net >= 0 && net <= 32) // Sanity check the user input if (net >= 0 && net <= 32) /* Sanity check the user input */
{ {
printf("Netmask bit: %d\n\n", net); printf("Netmask bit: %d\n\n", net);
addr = pow(2, 32-net); // Calculate number of addresses addr = pow(2, 32-net); /* Calculate number of addresses */
printf("%.0lf total addresses\n", addr); printf("%ld total addresses\n", addr);
hosts = addr-2; hosts = addr-2;
if (hosts < 0) // Check if number of usable hosts is a negative value /* Check if number of usable hosts is a negative value */
if (hosts < 0)
{ {
hosts = 0; // Set usable hosts to zero if it was negative hosts = 0; /* Set usable hosts to zero if it was negative */
} }
printf("%.0lf usable addresses for hosts\n", hosts); printf("%ld usable addresses for hosts\n", hosts);
return 0; return 0;
} }
else // If the user entered anything else than 0-32 else /* If the user entered anything else than 0-32 */
{ {
printf("Only values between 0-32 are accepted\n"); printf("Only values between 0-32 are accepted\n");
return 1; return 1;