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差异一目了然了。。 a和c 都被赋值为了7，但第2行和第4行是没有打印值的。 b和d的赋值在第3行和第5行运行时打印了结果，但本身值都为none，并没有被赋值成功。 这里就要提到其中一个答主说的， … O comando return faz sair da função, mas quando está dentro do main() ele também … · a função exit() encerra a execução da aplicação imediatamente. 在 matlab 中， return 关键字用于从函数中返回到调用它的位置。在 matlab 的函数中，你不需要显式地使用 return 来返回值，因为函数的输出是通过函数调用时指定的输出变量来返回的。但是，如果 … · 如果，当i等于0，第一次进入循环时，compare ()就不等于true，执行return 的话，return 是退出整个函数，还是退出for循环，还是接着执行i=1继续循环？