从文件中读取十六进制数

Question

This has me pretty bothered as I should be able to do it but when I read in the hex number and assign it to an unsigned int when I print it out I get a different number. Any advice would be great. Thanks

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main()
{
fstream myfile;
myfile.open("test.text");
unsigned int tester;
string test;
myfile >> hex >> tester;
cout << tester;
system("pause");
return 0;
}

Answer 1

I bet you don't get a "different number".

I bet you get the same value, but in decimal representation.

You're already extracting a hex-representation value ( myfile >> hex >> tester ); now insert one, too ( cout << hex << tester )!

Answer 2

This works for hex value in string format to int

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
using namespace std;

int main()
{
    fstream myfile;
    myfile.open("test.txt");
    string fromFile;
    unsigned int tester;

    myfile >> fromFile;
    istringstream iss(fromFile);
    iss >> hex >> tester;
    cout << tester;

    system("pause");
    return 0;
}

This works int to hex

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main()
{
fstream myfile;
myfile.open("test.txt");
unsigned int tester;
string test;
myfile >> tester;
cout << hex << tester;

system("pause");
return 0;
}

Also check your filename. In my file It had a 54 written on it than output was 36 in hex.