Decimal To Binary, Binary To Decimal

main.cpp

/*
	Decimal To Binary, Binary To Decimal By DreamVB
	Version 1.0
	Two functions to convert between decimal and binary

	Please feel free to use as you like.
	Feel free to update or fix an errors.

*/

#include <stdio.h>
#include <string>

char *Dec2Bin(int dec){
	char TempBin[32];
	int j = 0;
	int i = 30;
	int t = dec;
	int bitcnt = 0;

	//Get the number of bits that make up the number.
	while(t > 0){
		//Keep divideing by 2
		t/=2;
		//INC bit counter
		bitcnt++;
	}
	//Minus 1
	bitcnt--;
	
	while(i >=0)
	{
		//Build the binary number.
		if((dec & (1 << i)) != 0){
			TempBin[j] = '1';
		}else{
			TempBin[j] = '0';
		} 
		//INC Counters
		i--;
		j++;
   }
	
	//Reserve array contents
	for(i=bitcnt;i>=0;i--){
		//Reserve array chars
		TempBin[bitcnt-i] = TempBin[30-i];
	}

	//Convert char array to Char*
	i = strlen(TempBin);
	//Resize array to hold the data
	char *pBin =(char*)malloc(i+1*sizeof(char));
	//Copy from TempBin to pStr
	strcpy(pBin,TempBin);
	//Set ending
	pBin[bitcnt+1] = '\0';
	//Return
	return pBin;
}

int Bin2Dec(char*Bin){
	int dec = 0;
	int n = 0;
	//Convert binary number to decimal number
	for(int i=strlen(Bin)-1;i>-1;i--){
		//Check if bit is set
		if(Bin[i] == '1'){
			//Make decimal number
			dec+=pow(2,n);
		}
		//INC Counter
		n+=1;
	}
	//Return
	return dec;
}

void main(){
	printf("Decimal 518 to binary is %s\n",Dec2Bin(512));
	printf("Binary 1111110111011000 to decimal is %d\n",Bin2Dec("1111110111011000"));
}