COMPUTER SCIENCE

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  • COMPUTER SCIENCE
    • DATA REPRESENT-ATION
      • NUMBER BASES
        • BINARY
          • BASE 2- A COMPUTER MUST USE THIS
        • HEX
          • BASE 16- USED TO COMPRESS DATA
        • DENARY
          • BASE 10- WE USE THIS
      • IMAGES
        • BITMAPS
        • QUALITY
          • RESOLUT-ION
            • NO. OF PIXELS
              • MORE = BETTER QUALITY = LARGER FILE
          • COLOUR DEPTH
            • NO OF BITS USED TO DETERMINE COLOUR
              • MORE = BETTER QUALITY = LARGER FILE
      • SOUND
        • REPRESEN-TED IN BINARY
          • THE PC TAKES SAMPLES OF THE ORIGINAL SOUND TO PRODUCE A NEW DIGITAL ONE.
            • THIS CAUSES AN UNAVOIDA-BLE DROP IN QUALITY
        • QUALITY
          • SAMPLE RATE
            • SAMPLES PER SECOND. MEASURED IN Hz.
              • GREATER SAMPLE RATE = BETTER QUALITY = LARGER FILE.
        • FILES
          • MP3
            • THESE ARE SMALLER AND THEREFORE EASIER TO TRANSFER.
              • BECAUSE OF THIS, THE FILES ARE OF LESSER QUALITY THAN THE WAV.
          • WAV
            • THESE FILES ARE LARGER AND THEREFORE OF BETTER QUALITY.
              • HOWEVER, THEY ARE HARDER TO TRANSFER THAN THE MP3.
    • PYTHON
      • LOOPS
        • FOR- REPEATS SET NO OF TIMES
        • WHILE- REPEATS UNTIL A CONDITION IS FULFILLED
      • VARIABLES
        • THESE STORE VALUES. SPEAKING OF WHICH-
          • VALUE TYPES
            • INT- A WHOLE NUMBER E.G 7
            • FLOAT- A NUMBER WITH DECIMAL POINTS e.g 45.4545
            • STRING- TEXT E.G 'COMPUTER SCIENCE IS AWESOME'
            • BOOLEAN- SIMPLE. 'TRUE' OR 'FALSE'
      • OTHER STATEMEN-TS
        • IF-ELSE: IF THIS IS TRUE DO THIS, ELSE DO THAT.
        • PRINT(): PRINTS TO CONSOLE
        • INPUT(): IT HAS MORE THAN ONE USE
          • STOPPING PROGRAMS CLOSING
          • GETTING A USER INPUT

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