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https://github.com/processing/processing4.git
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59 lines
1.7 KiB
Plaintext
59 lines
1.7 KiB
Plaintext
/**
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* Operator Precedence
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*
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* If you don't explicitly state the order in which
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* an expression is evaluated, they are evaluated based
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* on the operator precedence. For example, in the statement
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* "4+2*8", the 2 will first be multiplied by 8 and then the result will
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* be added to 4. This is because the "*" has a higher precedence
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* than the "+". To avoid ambiguity in reading the program,
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* it is recommended that is statement is written as "4+(2*8)".
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* The order of evaluation can be controlled through placement of
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* parenthesis in the code. A table of operator precedence follows below.
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*
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*/
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// The highest precedence is at the top of the list and
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// the lowest is at the bottom.
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// Multiplicative: * / %
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// Additive: + -
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// Relational: < > <= >=
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// Equality: == !=
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// Logical AND: &&
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// Logical OR: ||
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// Assignment: = += -= *= /= %=
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size(640, 360);
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background(51);
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noFill();
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stroke(51);
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stroke(204);
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for(int i=0; i< width-20; i+= 4) {
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// The 30 is added to 70 and then evaluated
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// if it is greater than the current value of "i"
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// For clarity, write as "if (i > (30 + 70)) {"
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if (i > 30 + 70) {
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line(i, 0, i, 50);
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}
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}
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stroke(255);
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// The 2 is multiplied by the 8 and the result is added to the 4
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// For clarity, write as "rect(5 + (2 * 8), 0, 90, 20);"
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rect(4 + 2 * 8, 52, 290, 48);
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rect((4 + 2) * 8, 100, 290, 49);
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stroke(153);
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for (int i = 0; i < width; i+= 2) {
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// The relational statements are evaluated
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// first, and then the logical AND statements and
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// finally the logical OR. For clarity, write as:
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// "if(((i > 20) && (i < 50)) || ((i > 100) && (i < width-20))) {"
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if (i > 20 && i < 50 || i > 100 && i < width-20) {
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line(i, 151, i, height-1);
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}
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}
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