Binary To Decimal Program In C

Implementation

Implementation of this algorithm is given below −

#include <stdio.h>

int string_length(char s[])
{
	int i=0;

	while(s[i]!='\0')
		i++;
		
return i;	
}

int binary2decimal(char n[])
{
	int i,decimal,mul=0;

	for(decimal=0,i=string_length(n)-1;i>=0;--i,++mul)
		decimal+=(n[i]-48)*(1<<mul);

	return decimal;
}

int main()
{
   char n[] = "10101";
   int decimal;
   printf("Decimal equivalent of %s is : %d", n, binary2decimal(n));
   return 0;
}

Output

Output of the program should be −

Decimal equivalent of 10101 is : 21