Find the 16-bit 2s complementary binary representation for decimal number 1987 and -1987

What are the 16-bit 1s and 2s complements of the following binary numbers (i.e. negate the following numbers under 1s and 2s complement number systems), 0000000000010000, 1000111100001001, 0100111000100100?

Add the following 12-bit binary 2s complement numbers. Then convert each number to decimal and check the results, 011001101101+111010111011, 101011001100+111111111100.

Use the format SEEEEMMMMMMM (4 bits exponent and 7 bits mantissa). The exponent is stored excess-6. The implied decimal point is at the beginning of the mantissa. The sign is 1 for a negative number. Answer following questions:

Convert the decimal number 235 to floating point.

What is the range of numbers that can be stored in this format?

If we ask the computer to output the number stored as a. in decimal format, what the display will be?