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如果“条件表达式”的值是0,则—次循环体也不执行 如果“条件表达式”的值不为0,则至少执行—次循环 不论“条件表达式”的值是否为“真”,至少要执行一次循环 如果“条件表达式”的值恒为0,则无限次执行循环体
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