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我用的CCS9.1.0,用的编译器是GNU7.2.1,我如何在CCS上设置char的类型?是signed还是unsigned?

我用的CCS9.1.0,用的编译器是GNU7.2.1,我如何在CCS上设置char的类型?是signed还是unsigned?

不知道我该如何确定及控制我的程序的char型是signed char还是unsigned char?

烦请指教。。。