see code
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Rect A(100, 100, 100, 100); //x, y, width, hegiht Rect B(80, 80, 100, 100); //x, y, width, hegiht printf("intersection area= %d\n", (A&B).area()); printf("union area = %d\n", (A|B).area()); printf("instersection ratio %lf \n", (A&B).area() / float( (A | B).area() ));..