topical media & game development

topical media & game development

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

graphic-processing-site-examples-Basics-Math-OperatorPrecedence-OperatorPrecedence.pde / pde

Operator Precedence If you don't explicitly state the order in which an expression is evaluated, they are evaluated based on the operator precedence. For example, in the statement "4+2*8", the 2 will first be multiplied by 8 and then the result will be added to 4. This is because the "*" has a higher precedence than the "+". To avoid ambiguity in reading the program, it is recommended that is statement is written as "4+(2*8)". The order of evaluation can be controlled through placement of parenthesis in the code. A table of operator precedence follows below.


  
   
  // The highest precedence is at the top of the list and 
  // the lowest is at the bottom.
  // Multiplicative: * / %
  // Additive: + -
  // Relational: < > <= >=
  // Equality: == !=
  // Logical AND: &&
  // Logical OR: ||
  // Assignment: = += -= *= /= %=
  
  size(200, 200);
  background(51);
  noFill();
  stroke(51);
  
  stroke(204);
  for(int i=0; i< width-20; i+= 4) {
    // The 30 is added to 70 and then evaluated
    // if it is greater than the current value of "i"
    // For clarity, write as "if(i > (30 + 70)) {"
    if(i > 30 + 70) {
      line(i, 0, i, 50);
    }
  }
  
  stroke(255);
  // The 2 is multiplied by the 8 and the result is added to the 5
  // For clarity, write as "rect(5 + (2 * 8), 0, 90, 20);"
  rect(4 + 2 * 8, 52, 90, 48);
  rect((4 + 2) * 8, 100, 90, 49);
    
  stroke(153);
  for(int i=0; i< width; i+= 2) {
    // The relational statements are evaluated 
    // first, and then the logical AND statements and 
    // finally the logical OR. For clarity, write as:
    // "if(((i > 10) && (i < 50)) || ((i > 80) && (i < 160))) {"
    if(i > 20 && i < 50 || i > 100 && i < width-20) {
      line(i, 151, i, height-1);
    } 
  }

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

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