int转换为double
int i1,i2;
double d = (double)(i1/i2);//好像不行？

[解决办法]
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int i1,i2;
double d = (double)(i1/i2);//好像不行？
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是double d = ((double)i1)/((double)i2);

想想:double d = (double)(3/2);//果是1.5?1?