程序代码：

#include <iostream>
int main()
{
    using namespace std;
    float a = 2.34E + 22f;
    float b = a + 1.0f;
    cout << "a = " << a << endl;
    cout << "b - a = " << b - a << endl;
    return 0;
}

程序代码：

---------- 用msys2编译 ----------
017.cpp:5:15: error: exponent has no digits
    5 |     float a = 2.34E + 22f;
      |               ^~~~~
017.cpp: In function ‘int main()’:
017.cpp:5:23: error: unable to find numeric literal operator ‘operator""f’
    5 |     float a = 2.34E + 22f;
      |                       ^~~

输出完成 (耗时 0 秒) - 正常终止