c - How to convert netmask to network prefix length? -

i doing programming, wanna convert netmask network prefix length.

for example 255.255.255.0 ----> 24.

finally write code so.

const char *network = "255.255.255.0"; int n = inet_addr(netowrk); int = 0; while (n > 0) {     n = n << 1;     i++; 

}

i network count

you should first try compile code, can lot. there compilations errors because mistyped variable name "netowrk"

to calculate prefix instead left shift should try right shift , instead of using inet_addr try inet_pton().

for more details go through post ipv4 decimal different values?

here can check code:

int main() {     const char *network = "255.255.255.0";     int n;     inet_pton(af_inet, network, &n);     int = 0;      while (n > 0) {             n = n >> 1;             i++;     }      printf("network = %s, suffix = %d\n", network, i); }