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Aug 10th, 2009

converting from binary to decimal and vice versa

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hello there, I am working on a small c program that automatically detects whether the input given is a decimal number or a binary number and coverts accordingly.

what is the best way to convert a binary number to a decimal number and a decimal number to a binary number.

i found this to be the easiest when converting from binary to deicmal
http://www.wikihow.com/Convert-from-Decimal-to-Binary

but my program doesnt work..?

c Syntax (Toggle Plain Text)
/*decimal to binary*/
#include <stdio.h>
int main() {
	int dec;
	int hold=0;
	printf("decimal number : ");
	scanf("%d",&dec);
 
	hold=dec%2;
 
	while (hold!=1){
		if (hold == 0){
			printf("0");
		}else if(hold >1){
			printf("1");
		}else{
			printf("1");
		}
		hold=hold%2;
	}
}
/*decimal to binary*/
#include <stdio.h>
int main() {
	int dec;
	int hold=0;
	printf("decimal number : ");
	scanf("%d",&dec);
	
	hold=dec%2;
	
	while (hold!=1){
		if (hold == 0){
			printf("0");
		}else if(hold >1){
			printf("1");
		}else{
			printf("1");
		}
		hold=hold%2;
	}
}

what have i done wrong?

Last edited by revenge2; Aug 10th, 2009 at 8:51 pm.

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revenge2

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Aug 10th, 2009

Re: converting from binary to decimal and vice versa

You don't have any divide's in there. You can't just use modulo for the whole thing. Also, you forgot to read the number backwards.

Last edited by Hiroshe; Aug 10th, 2009 at 9:32 pm.

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Aug 10th, 2009

-1

Re: converting from binary to decimal and vice versa

c Syntax (Toggle Plain Text)
/*decimal to binary*/
#include <stdio.h>
 
void printBinary(const unsigned char val) {
 
  for(int i = 7; i >= 0; i--)
 
    if(val & (1 << i))
 
     printf("1");
 
    else
 
      printf("0");
  printf("\n");
 
} 
 
int main() {
	int dec;
	int hold=0;
	printf("Integer number : ");
	scanf("%d",&dec);
	printBinary((unsigned char)dec);	
}
/*decimal to binary*/
#include <stdio.h>

void printBinary(const unsigned char val) {

  for(int i = 7; i >= 0; i--)

    if(val & (1 << i))

     printf("1");

    else

      printf("0");
  printf("\n");

} 

int main() {
	int dec;
	int hold=0;
	printf("Integer number : ");
	scanf("%d",&dec);
	printBinary((unsigned char)dec);	
}

ambarisha.kn

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Aug 12th, 2009

Re: converting from binary to decimal and vice versa

hmmm why doesn't this work?

c Syntax (Toggle Plain Text)
#include <stdio.h>
 
void bin_c(int x);
 
int main(){
	int x;
	printf("Enter a number:");
	scanf("%d",x);
 
	bin_c(x);
	return 0;
}
 
void bin_c(int x){
 
	if (x == 1){
		printf("1");
	}
 
	while (x!=1){
		int y;
		y=x/2;
		if (y == 0){
			printf("0");
		}
		if (y > 1){
			printf("1");
		}
		if (y == 1){
			printf("1");
		}
		bin_c(y);
	}
 
}
#include <stdio.h>

void bin_c(int x);

int main(){
	int x;
	printf("Enter a number:");
	scanf("%d",x);
	
	bin_c(x);
	return 0;
}

void bin_c(int x){
	
	if (x == 1){
		printf("1");
	}
	
	while (x!=1){
		int y;
		y=x/2;
		if (y == 0){
			printf("0");
		}
		if (y > 1){
			printf("1");
		}
		if (y == 1){
			printf("1");
		}
		bin_c(y);
	}
	
}

i know i have to reverse the order but this doesnt work why is this?

Last edited by revenge2; Aug 12th, 2009 at 2:01 am.

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Aug 12th, 2009

Re: converting from binary to decimal and vice versa

To get a binary value from a decimal value
v = val %2; -- v will contain the value of the ones digit. Then, after you get the digit, remove it to get the next digit:
v = val /2; Loop until val is 0.

WaltP

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Mar 22nd, 2010

-2

Re: converting from binary to decimal and vice versa

could you pls. do me a program that converting a binary to decimal or decimal to binary with a simple codes in turbo c, which i can easily understand.. for example i will enter an number 1 then it will be automatically to convert it to its binary value. thank u! i will wait for your help! pls. help me..

Last edited by WaltP; Mar 22nd, 2010 at 4:39 am. Reason: Leaving this hijack post here because the answer is in this thread. Maybe you can figure it out if you start reading.

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