C program fails to execute more than one statement at the same time

Question

I am trying to make a c program that converts the decimal the user entered into a binary and octal number.

Given the user entered 24, my output should look like this:

24 in Decimal is 11000 in Binary.
24 in Decimal is 30 in Octal.

But the terminal only executes the decimal to binary conversion. Hence my current output look like this:

24 in Decimal is 11000 in Binary.
0 in Decimal is 0 in Octal.

Here is the part containing the conversions. It is inside a switch-case statement.

        {
        case 'A': case 'a': 
        {
            int a[10], input, i;  //variables for binary and the user input
            int oct = 0, rem = 0, place = 1; //variables for octal
            printf("Enter a number in decimal: ");
            scanf("%d", &input);

//decimal to binary conversion            
            printf("\n%d in Decimal is ", input);
            for(i=0; input>0;i++)
                {
                    a[i]=input%2;
                    input=input/2;
                }
            for(i=i-1;i>=0;i--)    
            {printf("%d",a[i]);}

//decimal to octal conversion
            printf("\n%d in Decimal is ", input);
            while (input)
            {rem = input % 8;
            oct = oct + rem * place;
            input = input / 8;
            place = place * 10;}
            printf("%d in Octal.", oct);

        }
            break;

The octal conversion only executes when I remove the decimal to binary portion. But I want both of them to execute at the same time.