/*this program check if an ipAddress is correct*/ #include #include #include using namespace std; /*check function check if the part of the ip Address is between 0 or 255*/ bool check(string const &str) { bool valid = false; switch(str.length()) { case 1: valid = (str[0] >= '0' && str[1] <= '9'); break; case 2: valid = ((str[0] >= '0' && str[0] <= '9') && (str[1] >= '0' && str[1] <= '9')); break; case 3: valid = ((str[0] >= '0' && str[0] <= '2') && (str[1] >= '0' && str[1] <= '5') && (str[2] >='0' && str[2] <= '5')); break; default: break; } return valid; } int main() { string ipAddress("0.0.0.0"); cout << "enter the ip address" << endl; getline(cin, ipAddress); vector words; vector valid; //help string use to separate the ipAddress string string help; for(int i(0); i < ipAddress.length(); i++) { if(ipAddress[i] != '.') help += ipAddress[i]; else { words.push_back(help); help.clear(); } } //check if all string in vector are correct for(int i(0); i < words.size(); i++) { valid.push_back(check(words[i])); } int nbValidStrings(0); for(int i(0); i < valid.size(); i++) { if(valid[i]) nbValidStrings++; } bool isAnIpAddress(nbValidStrings == valid.size()); if(isAnIpAddress) cout << "Valid Ip Address" << endl; else cout << "Invalid Ip Address" << endl; return 0; }