Handling Data in Algorithm
- 2. CONSTANTS IN A PROGRAM, VALUES THAT DOES NOT CHANGE UNDER A GIVEN SET OF CONDITIONS Use a unique identifier Declared at the start of the program Eg: CONST PI=3.14; CONST VAT_RATE=0.2
- 3. USES OF DECLARING CONSTANTS In case, if the value has happened to change, only need to change in one place. Easier to understand the code as instead of numbers identifiers have been used.
- 4. VARIABLES AND DATATYPES WHAT IS A VARIABLE? A CHARACTERISTIC, QUANTITY OR NUMBER THAT INCREASES OR DECREASES OVER TIME OR TAKES DIFFERENT VALUES IN DIFFERENT SITUATIONS. int number=1; Int:number
- 5. Date Type Type of data Amount of memory Integer Whole number 2 bytes Real A number with a decimal part 4 bytes Char A single character 1 byte String Zero or more characters 1 byte per character Boolean Either true or false 1 byte DATATYPES AND MEMORY SIZE REQUIRED
- 6. NUMERIC DATA TYPES DIV AND MOD DIV- divides the number and gives the answer as a whole number. 13 DIV 4=3 MOD- divides the number and gives the remainder as a whole number. 13 MOD 4=1
- 7. ARRAYS An array is a group of data items of the same data type stored under one identifier one after another in memory locations.
- 8. BENEFITS OF AN ARRAY Easier to follow the code and find bugs easily Data can be processed using a FOR loop
- 9. ERRORS Mainly there are two types of ERRORS Syntax errors - misspelt code Logic errors – even the code works, but it does not do what you want to do.
- 10. Syntax Errors Translators expect to have a certain format known as syntax. In Delphi, VariableName : Datatype; In java int variableName; What are the possible syntax errors?
- 11. Logic Errors Even though the code works but we may not be able to achieve the expected result. These are because of logic errors. total=a-b*2 for(int i=10;i>10;i++){ print (i); }
- 12. How can we overcome Logic Errors
- 13. TESTING Test purpose Test data Expected Outcome Actual Outcome Design and Planning stage Final stage/Testing If there is a range specified in the code, testing should be done between the allowed ends and as well as not allowed ends. This is known as testing boundary data or extremes.
- 14. IDE What is IDE?
Editor's Notes
- #16: Numeric data types- slide 6