Convert Decimal to Radix

Question

Kombat 0 Light Poster

14 Years Ago

You are required to write a C program that accepts two decimal integers, say d and r. You
may assume that the first decimal integer d is nonnegative and that the second decimal integer r
which represents the radix, will be one of 2, 3, 4, . . ., 15, 16. The program should convert the first
decimal integer d into its representation in radix r and print the result.

I seriously am clueless on how to start. What I want to do is take a decimal divide by a base record the remainder and keep doing so with the decimal until the decimal is 0 and record the remainders. That is how I get the binary.

This is what I got so far its absolutely nothing

#include <stdio.h>

int main(void){
    
    int d, r, temp;
    temp = d = r = 0;
    temp = d/r;

c

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Latest Post 14 Years Ago Latest Post by yellowSnow

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Salem 5,138 Posting Sage

14 Years Ago

> That is how I get the binary.
That's how you do it for every other base as well.

Salem 5,138 Posting Sage

14 Years Ago

Well it's good for bases < 10 char basechars[] = "0123456789"; and printf("%c", basechars[r] );

Salem 5,138 Posting Sage

14 Years Ago

Store each char in another array, then print it out backwards?

Salem 5,138 Posting Sage

14 Years Ago

Post your code!
Did you initialise i ?

yellowSnow commented: For utter utter patience! +7

Kombat commented: very very patient and helpful!! +1

mvmalderen commented: You're a patient man Salem. And the help you provide is excellent! +23

yellowSnow 607 Posting Whiz in Training

14 Years Ago

Initialize k to zero.
Also, move your declarations for r and basechars outside of the loop.

Kombat commented: Very Helpful +1

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You're a patient man Salem. And the help you provide is excellent!

Kombat 0 Light Poster · Answer 1 · 2009-09-17T10:40:08+00:00

fixed it to this

#include <stdio.h>
 int main(void){
    
    int d, r, temp;
    d = r = 0;
    

    for(temp = d; temp !=0; temp%r);
}

Kombat 0 Light Poster · Answer 2 · 2009-09-17T22:13:48+00:00

I've been working on this for a while and got this code. It is a pretty good start. But not sure where to go from here

#include <stdio.h>
int main(void) {

int d, b, c;

printf("please enter decimal and base");
scanf("%d\n", &d);
scanf("%d", &b);

while(d!=0){
int r;
r = d%b;
d = d/b;
printf("\n%d", c);
}

}

I do not want it to print in reverse

Kombat 0 Light Poster · Answer 3 · 2009-09-17T22:37:09+00:00

#include <stdio.h>
int main(void) {

int d, b, c;

printf("Enter decimal and base:  ");
scanf("%d", &d);
scanf("%d", &b);

if(b<2){
        printf("Your base is too low! \n");
        }
        else{

while(d!=0){
int r;
r = d%b;
d = d/b;
char basechars[] = "0123456789ABCDEF"; 
printf("%c", basechars[r]);

}
}

Thanks, however it is still printing the result in reverse:

Example: 25 3 it prints 122 when answer should be 221

Kombat 0 Light Poster · Answer 4 · 2009-09-17T23:02:36+00:00

#include <stdio.h>
int main(void) {

int d, b, c;

printf("Enter decimal and base:  ");
scanf("%d", &d);
scanf("%d", &b);

if(b<2){
        printf("Your base is too low! \n");
        }
        else{

while(d!=0){
int r;
r = d%b;
d = d/b;
char basechars[] = "0123456789ABCDEF"; 
printf("%c", basechars[r]);

}
}
system("PAUSE");
}

I have the char's stored in an array however the conversion is being printed out backwards.

Salem 5,138 Posting Sage · Answer 5 · 2009-09-17T23:11:18+00:00

Salem 5,138 Posting Sage

14 Years Ago

> basechars[r]
You're printing them, not storing them!

Kombat 0 Light Poster · Answer 6 · 2009-09-17T23:58:26+00:00

I am not sure how to do that. I tried this

int r;
char i;
char result[ARRAY_SIZE];
r = d%b;
d = d/b;
char basechars[] = "0123456789ABCDEF";
basechars[r] = i;
printf("%c", result[i]);

but it doesn't work

Salem 5,138 Posting Sage · Answer 7 · 2009-09-18T02:33:25+00:00

result[numchars++] = basechars[r];

When you're done, print from numchars-1 back down to 0 (one char at a time).

Kombat 0 Light Poster · Answer 8 · 2009-09-18T02:54:46+00:00

when I add the result[i++] the program crashes, I think because it keeps incrementing infinity

Kombat 0 Light Poster · Answer 9 · 2009-09-18T03:05:50+00:00

#include <stdio.h>
#define SIZE 25
int main(void) {
    int d, b;
    
    
    printf("Enter decimal and base:  ");
    scanf("%d", &d);
    scanf("%d", &b);
    
    if(b<2){
        printf("Your base is too low! \n");
        }
        else if (b >16){
             printf("Your base is too high! \n");
             }
        else if(d==0){
              printf("%d \n", 0);
              }
        else{
             
             while (d!=0){
                         char temp[SIZE];
                         char result[SIZE];
                         int i, r, n ;
                         r = d%b;
                         d = d/b;
                         char basechars[] = "0123456789ABCDEF";
                         temp[i++] = basechars[r];
                         result[n++] = temp[--i];
                         
                         printf("%c", result);                         
                     }
}
                        system("PAUSE");

                        }

yellowSnow 607 Posting Whiz in Training · Answer 10 · 2009-09-18T05:21:55+00:00

You're making this more difficult than it needs to be. Look at this code snippet:

while (d != 0) {
        r = d % b;
        d = d / b;
        result[len++] = basechars[r];
    }

    for (i = len-1; i >= 0; --i) {
        printf("%c", result[i]);
    }

Kombat 0 Light Poster · Answer 11 · 2009-09-18T05:31:24+00:00

Wow thanks it works however it is showing a lot of weird symbols along with the answer.

yellowSnow 607 Posting Whiz in Training · Answer 12 · 2009-09-18T05:34:11+00:00

Wow thanks it works however it is showing a lot of weird symbols along with the answer.

Post your full code.
And don't thank me - Salem is the one you should be thanking.

Kombat 0 Light Poster · Answer 13 · 2009-09-18T05:34:53+00:00

Kombat 0 Light Poster

14 Years Ago

I pmed you it

Edited 14 Years Ago by Kombat because: n/a

Kombat 0 Light Poster · Answer 14 · 2009-09-18T06:03:04+00:00

the moving r and basechars made it fail but initializing the k to zero did the trick.

Thanks very much to you and many thanks to salem :)

yellowSnow 607 Posting Whiz in Training · Answer 15 · 2009-09-18T06:08:58+00:00

the moving r and basechars made it fail but initializing the k to zero did the trick.
Thanks very much to you and many thanks to salem :)

Not sure why moving those declarations outside the loop would make it fail - it works for me:

#include <stdio.h>

#define SIZE 64

int main(void) {
    int d, b, k=0, i, r;
    char result[SIZE];
    char basechars[] = "0123456789ABCDEF";

    printf("Enter decimal and base:  ");
    scanf("%d", &d);
    scanf("%d", &b);

    if (b < 2) {
        printf("Your base is too low! \n");
    } else if (b > 16) {
        printf("Your base is too high! \n");
    } else if (d == 0) {
        printf("%d \n", 0);
    } else {

        while (d != 0) {
            r = d % b;
            d = d / b;
            result[k++] = basechars[r];
        }
        for (i = k - 1; i >= 0; --i) {
            printf("%c", result[i]);
        }

    }
    return 0;
}

BTW - if you're happy with the outcome - flag the post as solved.

Convert Decimal to Radix

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