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Operators

Operators. The Basics. + (addition) - (subtraction) * (multiplication) / (division) % (modulo) ( ) (parentheses). Bitwise operations. << (shift left) >> (shift right) | (bitwise or) & (bitwise and) ^ (bitwise exclusive or) ~ (one’s complement). Logical operations.

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Operators

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  1. Operators

  2. The Basics • + (addition) • - (subtraction) • * (multiplication) • / (division) • % (modulo) • ( ) (parentheses)

  3. Bitwise operations • << (shift left) • >> (shift right) • | (bitwise or) • & (bitwise and) • ^ (bitwise exclusive or) • ~ (one’s complement)

  4. Logical operations • || (logical or), && (logical and) • ! (logical not) • != (not equal), == (equal) • < (less than), > (greater than) • <= (less than/equal), >= (greater than/equal) • 0 == false, anything else == true

  5. And a few more... • ? : (a three way arithmetic if) • & (address of), * (dereference) • ++ (increment), -- (decrement) • -> (dereference), . (member) • sizeof() • [ ] (array subscript)

  6. ( ) (function call) [ ] (subscripts) -> and . (dereference) sizeof ! ~ - + ++,-- &, * (address,deref) *, /, % +, - <<, >> <,<=,>,>= ==,!= & | &&, ||, = Order of Precedence

  7. Control statements

  8. if • if (x == 5) x=4; • if (x==5) x=0; else x=1; • if (x>=5 && x<=10) printf(“Bingo!\n”);

  9. for • for (i=0;i<10;i++) printf(“%d\n”,i); • for(i=0;i<10;i=i+2) • for(;;)

  10. while • while (x != 0) x=x-1;

  11. do ...while • do x=x+1 while (x < 100);

  12. More control statements

  13. switch • char key; • scanf(“&c”,&key); • switch (key) { case ‘a’: printf(“a is for aardvark\n”); case ‘b’: printf(“b is for beer\n”);break; case ‘c’: printf(“c is for cow\n”);break; default: printf(“Just my ABC’s\n”);}

  14. break • Necessary for switch statements • Can be used in while and for statements • “break” out of a loop

  15. continue • Similar to break but keeps within the loop

  16. Printing to the printer • The ‘lp’ command • lp -d student myprog.c • DON’T print a.out • lpstat -p • cancel student

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