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Interchange between base 2 to 16

Following program converts the number from any base between 2-16 to any base between 2-16. Idea taken from C-FAQ by Steve Summit.

Submitted By: Xing

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Views: 2,918

Language: C++

Last Modified: December 3, 2006

Snippet

#include<iostream>
char *BaseConversion(unsigned int , int );
int main() {
std::cout<<"Hexadecimal 'a' to Decimal : "<<BaseConversion(0xa,10)<<std::endl;
std::cout<<"Decimal '10' to Hexadecimal: "<<BaseConversion(10,16)<<std::endl;
std::cout<<"Hexadecimal 'a' to Octal : "<<BaseConversion(0xa,8)<<std::endl;
std::cout<<"Octal '12' to Hexadecimal : "<<BaseConversion(012,16)<<std::endl;
std::cout<<"Decimal '10' to Octal : "<<BaseConversion(10,8)<<std::endl;
std::cout<<"Octal '12' to Hexadecimal : "<<BaseConversion(012,16)<<std::endl;
return 0;
}
char *BaseConversion(unsigned int number, int base) {
static char buffer[50];
char *ptr=buffer;
//Checking for invalid base input
if(base < 2 || base > 16)
return NULL;
//Going to the end of buffer
ptr = &buffer[sizeof(buffer)-1];
*ptr = '\0';
//Actual Conversion
while(number != 0) {
*--ptr = "0123456789abcdef"[number % base];
number /= base;
}
return ptr;
}

Copy & Paste

#include<iostream>

char *BaseConversion(unsigned int , int );

int main() {
    std::cout<<"Hexadecimal 'a' to Decimal : "<<BaseConversion(0xa,10)<<std::endl;
    std::cout<<"Decimal '10' to Hexadecimal: "<<BaseConversion(10,16)<<std::endl;
    std::cout<<"Hexadecimal 'a' to Octal   : "<<BaseConversion(0xa,8)<<std::endl;
    std::cout<<"Octal '12' to Hexadecimal  : "<<BaseConversion(012,16)<<std::endl;
    std::cout<<"Decimal '10' to Octal      : "<<BaseConversion(10,8)<<std::endl;
    std::cout<<"Octal '12' to Hexadecimal  : "<<BaseConversion(012,16)<<std::endl;
    return 0;
}

char *BaseConversion(unsigned int number, int base) {
    static char buffer[50];
    char *ptr=buffer;

//Checking for invalid base input
     if(base < 2 || base > 16)
          return NULL;

//Going to the end of buffer
     ptr = &buffer[sizeof(buffer)-1];
     *ptr = '\0';

//Actual Conversion
     while(number != 0) {
          *--ptr = "0123456789abcdef"[number % base];
          number /= base;
     }
     return ptr;
}