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Operators Expressions Lecture PGT Comp Sci Faculty JNV Naugar

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Operators and Expressions Lecture 3 by Jugal Kishor Bajia (PGT Comp. Sc.) Faculty of Computer Science & Informatics Practics JNV Naugar(Raj)
Elements of a program ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Elements of a program ,[object Object],[object Object],[object Object]
Statement ,[object Object],[object Object],[object Object],[object Object]
Some types of statement in C++
An expression statement is a statement that results a value Some examples of expression Value ,[object Object],[object Object],The literal itself ,[object Object],[object Object],[object Object],[object Object],The content of the variable The result of the operation
Operators ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Binary expression
Unary Expression
Ternary Expression (a>2) ? 1: 0 Operator First operand is a condition Second operand is a value Third operand is another value
Arithmetic operators ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Arithmetic operators: +, * ,[object Object],[object Object],[object Object]
Arithmetic operator:  ,[object Object],[object Object],[object Object],e.g. 31 - 2 e.g. -10
Arithmetic operator: / ,[object Object],[object Object],e.g. 5 / 2 is 2, not 2.5
Arithmetic operator: % ,[object Object],[object Object],[object Object],[object Object],e.g. 5 % 2 is 1, 6 % 2 is 0
 
 
Relational operators ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
Logical operators (also called Boolean operators) ,[object Object],[object Object],[object Object],[object Object],[object Object]
 
Assignment operator: = ,[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Special assignment operators ,[object Object],[object Object],[object Object],[object Object],[object Object]
Special assignment operators ,[object Object],[object Object],[object Object],[object Object],[object Object],num = 10; ans = num++; num = 10; ans = ++num; First increment num, then assign num to ans. In the end, num is 11 ans is 11 First assign num to ans, then increment num. In the end, num is 11 ans is 10 post-increment pre-increment
Result of postfix Increment
Result of Prefix Increment
Precedence & associativity ,[object Object],[object Object],[object Object]
Precedence & associativity ,[object Object],[object Object],[object Object]
Precedence & associativity ! Unary – * / % + – < <= >= > = = != && || = higher precedence lower precedence Associativity: execute left-to-right ( except for = and unary – )
[object Object],[object Object]
[object Object],[object Object]
Precedence & associativity ,[object Object],[object Object],[object Object],Not sure? Confused? then use parentheses in your code!

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Operators Expressions Lecture PGT Comp Sci Faculty JNV Naugar

  • 1. Operators and Expressions Lecture 3 by Jugal Kishor Bajia (PGT Comp. Sc.) Faculty of Computer Science & Informatics Practics JNV Naugar(Raj)
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  • 5. Some types of statement in C++
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  • 10. Ternary Expression (a>2) ? 1: 0 Operator First operand is a condition Second operand is a value Third operand is another value
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  • 27. Result of postfix Increment
  • 28. Result of Prefix Increment
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  • 31. Precedence & associativity ! Unary – * / % + – < <= >= > = = != && || = higher precedence lower precedence Associativity: execute left-to-right ( except for = and unary – )
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