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pow(x,y)
exp( x, 1/y)
float x=27.0f;
float y=1/3.0f; //¿ª3´Î·½
float z=pow(x,y);
printf("%f",z);
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pow(x, 1.0/y)
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exp(log(x)/y)
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char *c = "hello,world";
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int i;
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