Page 44 - Computer Science V2.0 Class 11

Incidentally, the RGB triplet (FF, FF, 00) yields yellow colour (Table 2.9).
Colour: Yellow
Table 2.9: RGB code in binary and Hexadecimal for the colour–Yellow

Binary Value Hexadecimal Value
RED 11111111 FF
GREEN 11111111 FF
BLUE 00000000 00

Write the RGB code for the following colours:
a. Black (absence of all colours)
b. White (presence of all colours in full intensity)
c. Red
d. Green
e. Blue

2.5 Expressing Numbers in Different Number Systems

We have learnt about some commonly used number systems. Given a number (expressed in a number system), we can
express it in another number system. Next, we will study the transformation of integers from one number system to
another and then move to the transformation of fractional numbers from one number system to another. In this book,
we will restrict the discussion to non-negative numbers.
2.5.1 Transforming Integers from One Number System to Another

Decimal to Binary Conversion
To convert a whole decimal number to binary, we follow the following steps:
1. Divide the number by 2.
2. Note the remainder.
3. Repeat steps 3a and 3b until the quotient becomes 0
3a. Divide the quotient by 2
3b. Note the remainder
4. Write the remainders in reverse order from the binary number.

Example 1: To convert the number (70 ) to its binary equivalent.
10
2 70 Remainder
2 35 0

2 17 1
2 8 1

2 4 0
2 2 0

2 1 0
2 0 1

(70) = (1000110) 2
10

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