Binary conversion (large number of decimal conversions into binary)

title describes converting a decimal non-negative integer up to 30 digits to a binary output. Input Description:

Multiple sets of data, each behaving as a decimal non-negative integer with a length not exceeding 30 bits.
(Note that the number of 10 binary digits may be 30, not a 30bits integer)

Output Description:

The binary number that corresponds to the output of each row.

Example 1 input

0
1
3
8

Output

0
1
1000

#include <iostream>
#include <string.h>
#include <cstring>
using namespace std;

int main () {
	char str[32];
    int Input[32],len;
    int output[100];
    while (~SCANF ("%s", &str)) {
		len=strlen (str);
        for (int i=0;i<len;i++) {
            input[i] = str[i]-' 0 ';
        }
        memset (output,0,sizeof (output));
        int sum = 1,d = 0, k = 0;
        while (sum) {
            sum = 0;
            for (int i=0;i<len;i++) {
                d = input[i]/2;
                sum + = D;
                if (i = = (len-1)) {
                    output[k++] = input[i]% 2;
                }
                else
                    input[i+1] + = (input[i]%2) *10;
                Input[i] = D;
            }
        }
        if (k = = 0) 
            cout<<0;
        else{for
            (int i=k-1;i>=0;i--)
                cout<<output[i];
        }
        cout<<endl;
    }
    return 0;
}