UVa 446 - Kibbles "n" Bits "n" Bits "n"

Problem link

Keyword: base conversion, bit-wise operation

Algorithm:

Use scanf %X to get hexadecimal numbers.
Transform to binary numbers and output the result in decimal form.

Code:

#include<cstdio>

int main()
{
    int t, a, b;
    char op;
    scanf( "%d", &t );

    while( t-- )
    {
        scanf( "%X %c %X", &a, &op, &b );
        int result = op == '-'? a-b : a+b;
        for( int i = 12; i >= 0; --i )
            printf( "%d", ( a & 1 << i ) / ( 1 << i ) );
        printf( " %c ", op );
        for( int i = 12; i >= 0; --i )
            printf( "%d", ( b & 1 << i ) / ( 1 << i ) );
        printf( " = %d\n", result );
    }
    return 0;
}