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int a = 7, b = 2; double res1 = a / b; double res2 = static_cast<double>(a) / b;
res1 = 3.0,res2 = 3.5
res1 = 3.5,res2 = 3.0
res1 = 3,res2 = 3
res1 = 3.5,res2 = 3.5