void ftest() { { std::chrono::steady_clock::time_point time = std::chrono::steady_clock::now(); doubleTest(5 * 10000000); std::chrono::steady_clock::time_point dTime = std::chrono::steady_clock::now(); unsigned int ms = std::chrono::duration_cast<std::chrono::milliseconds>(dTime - time).count(); printf("%u ms\n", ms); } { std::chrono::steady_clock::time_point time = std::chrono::steady_clock::now(); floatTest(5 * 10000000); std::chrono::steady_clock::time_point dTime = std::chrono::steady_clock::now(); unsigned int ms = std::chrono::duration_cast<std::chrono::milliseconds>(dTime - time).count(); printf("%u ms\n", ms); } }
void ch2() { printf("==========ch2()\n"); // float PI3.14159; // 非法标识符,内含小数点,非数字、字母、下划线,因此非法 ch2_1(); ch2_2(); ch2_3(); ch2_4(); ch2_5(); ch2_6(); ch2_7(); ch2_8(); floatTest(); doubleTest(); testAdd1(); testAdd2(); testAdd3(); testprintf(); test_and_or(); expression(); //getchar(); }