Convert hex number to integer
#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
long hex2int(const string& hexStr);
int main( ) {
string str1 = "0x12AB";
cout << hex2int(str1) << endl;
string str2 = "12AB";
cout << hex2int(str2) << endl;
}
long hex2int(const string& hexStr) {
char *offset;
if (hexStr.length( ) > 2) {
if (hexStr[0] == "0" && hexStr[1] == "x") {
return strtol(hexStr.c_str( ), &offset, 0);
}else{
cout << "hex must start with 0x";
return 0;
}
}
}4779
hex must start with 0x0
Fill space with ?
#include <iostream>
#include <iomanip>
using namespace std;
int main(void){
cout << hex << 100 << endl;
cout << setfill("?") << setw(10) << 2343.10 << endl;
}Show the base in hexadecimal
#include <iostream>
#include <iomanip>
#include <string>
#include <sstream>
using namespace std;
int main( ) {
stringstream ss;
ss << showbase << hex << 16; // Show the base in hexadecimal
cout << ss.str( ) << endl;
}0x10
