CIS133C CLASS 4


Structured design . . .
  • Control structures:
    1. Sequence is the execution of one unconditional action after another.
    2. Selection is the execution of either of two actions, depending on a condition.
    3. Iteration is the repetition or looping of statements.

  • Design tools:
    1. PSEUDOCODE
    2. FLOW CHARTS
    3. HIERARCHY CHARTS
    4. WARNIER/ORR


The structure of data . . .
  • A BIT is the smallest addressible unit and contains ones or zeros which denote an on or off electrical charge. Doesn't that sound like the binary numbering system?
Enter a positive decimal number in the first box, click the equal sign, and you will see the binary equivalent in the second box . . .
to base

  • A BYTE consists of eight bits and represents a character such as a lower case 'z' or the digit '4'.
A byte:

  • A FIELD consists of a series of bytes representing data.
A field of ten bytes:
BYTE1BYTE2 BYTE3BYTE4 BYTE5BYTE6 BYTE7BYTE8 BYTE9BYTE10

  • A RECORD is made up of one or more fields.
A record of seven fields:
FIELD1FIELD2 FIELD3FIELD4 FIELD5FIELD6FIELD7

  • A FILE contains records.
A file of three records each with six fields:
REC1,FIELD1REC1,FIELD2 REC1,FIELD3REC1,FIELD4 REC1,FIELD5REC1,FIELD6
REC2,FIELD1REC2,FIELD2 REC2,FIELD3REC2,FIELD4 REC2,FIELD5REC2,FIELD6
REC3,FIELD1REC3,FIELD2 REC3,FIELD3REC3,FIELD4 REC3,FIELD5REC3,FIELD6







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