0_0_39192134_20607.cpp 0_0_39192134_20607.cpp(5) : error C3861: “sqrt”: 找不到标识符 0_0_39192134_20607.cpp(14) : error C3861: “scanf_s”: 找不到标识符 0_0_39192134_20607.cpp(16) : error C3861: “printf”: 找不到标识符