(x=4*5, x*5), x+25
25
20
100
45
// 逗号表达式分析过程 // 赋值符号“=” 优先级要高于“,”,因此小括号会影响其计算结果 x = 4 * 5, x * 5 // x = 20 y1 = (x = 4 * 5, x * 5) // y1 = 100 y2 = x = 4 * 5, x * 5 // y2 = x = 20 y3 = (x = 4 * 5, x * 5), x + 25 // y3 = 100 y4 = ((x = 4 * 5, x * 5), x + 25) // y4 = 20 + 25 = 45
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