hex to dec. c++ codes?
please help, there seems to be an error here
#include "stdafx.h"
#include <iostream>
#define BUFF 8
using namespace std;
int main () {
int num;
char input[BUFF];
cout<< "Enter a hexadecimal number: ";
cin>> input;
int answer = hex2int (input, strlen(input));
cout<< "Converting... \n\n";
cout<< "Decimal equivalent is: " << answer << endl << endl;
system ("pause");
return 0;
}
unsigned long hex2int(char *a, unsigned int len)
{
int i;
unsigned long val = 0;
for(i=0;i<len;i++)
if(a[i] <= 57)
val += (a[i]-48)*(1<<(4*(len-1-i)));
else
val += (a[i]-55)*(1<<(4*(len-1-i)));
return val;
}
HOW DO I CORRECT IT
please do rewrite the right codes.
Comments
Since you said "rewrite"
#include <iostream>
#include <string>
int main()
{
std::cout << "Enter a hexadecimal number: ";
unsigned long answer;
std::cin >> std::hex >> answer;
std::cout << "Converting... \n\n";
std::cout << "Decimal equivalent is: " << answer << "\n\n";
}
test: https://ideone.com/dL49O
as for the things you did wrong:
1. you're reading with "cin >>" into an array, that makes your program extremely vulnerable to any malicious user. It will execute any code I input after the 8th symbol.. >> is for strings, numbers, etc, but if you must write to an array, use cin.getline()
3. you didn'r declare hex2int before use
4. you didn't use the debugger mode to step through hex2int to see where it goes wrong.
please refer-
daniweb.com/software-development/c/threads/188797