Sunday, July 8, 2007

Write a C progam to convert from decimal to any base (binary, hex, oct etc...).

Here is some really cool C code

#include < stdio.h >

int main()
decimal_to_anybase(10, 2);
decimal_to_anybase(255, 16);

decimal_to_anybase(int n, int base)
int i, m, digits[1000], flag;

printf("\n\n[%d] converted to base [%d] : ", n, base);


//Eliminate any leading zeroes
for(i--;i >= 0;i--)
if(!flag && digits[i]!='0')flag=1;


Anonymous said...

I could get your code to work.
It seemed to get stuck doing the same thing over, meaning result was the number 9 for each base.

Here is my example fixing yours, but with changes that made more sense to mea and I think make the code more understandable as to what it is doing.

#include stdio.h /*altered tag*/
void decimalToAnyBase(int, int);
int num, base;

while (scanf("%d %d",&num, &base) == 2)
printf("%d converted to base %d\n",num,base);

return 0;

/* define the decimalToAnyBase() function */
void decimalToAnyBase(int n, int b)
int i, m, digits[1000], flag;

i = 0;
m = n % b;

// Keep going if number 'n' is > the base and not zero
if (n >= b)
printf("digits[%d] = %d.%d\t\tn = %d\n",i,digits[i],m,n);
n = n / b;
decimalToAnyBase(n,b); /* recursive call */
} else if (n != 0) {
printf("digits[%d] = %d.%d\t\tn = %d\n",i,digits[i],m,n);
n = n / b;

Hope this helps...
Mark (medeepthinker)

medeepthinker said...

Hey I think I just managed to sigh up. Cool!

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subburajr said...

int convert(unsigned int num, int base)
static char buf[33];
char *ptr;
int i = 0,j;



for(j = 0; j <= strlen(ptr); j++){

if( ('0' <= ptr[j]) && ('9' >= ptr[j]))
i = (i<<4)+(ptr[j]-'0');
else if(('a' <= ptr[j]) && ('f' >= ptr[j]))
i = (i<<4) + (ptr[j]-'a') + 0xa;
else if(('A' <= ptr[j]) && ('F' >= ptr[j]))
i = (i<<4)+ (ptr[j]-'A') + 0xa;
return i;

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void dec2AnyBase(int value, int base) {
if (value) {
dec2AnyBase(value / base, base);
printf("%c", "0123456789abcdefghijklmnopqrstuvwxyz"[value % base]);

int main(void) {
dec2AnyBase(10, 2);
dec2AnyBase(255, 16);