Octal to Binary Daily Code Byte

#1

Please have a look at my code . It is not passing the first and fourth test case . Also , do suggest if you have a better approach.
Link :https://ide.codingblocks.com/s/84043

#2 
So, in this case, to convert the octal number to decimal number.
Then, Convert the decimal number to binary.

int multiplier=1;

int ans=0;
int dec=0;

while(n!=0){    // Convert octal to decimal
    int rem=n%10;
    dec=dec+rem*multiplier;
    multiplier*=8;
    n=n/10;
}
multiplier=1;

while(dec!=0){   // convert decimal to binary
    int rem=dec%2;
    ans=ans+rem*multiplier;
    multiplier*=10;
    dec=dec/2;
}

return ans;
#3

what is wrong in my code ?

#4

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