您正在尝试使用 '%f' 标记扫描浮点数，但提供了一个双精度数.将浮点变量传递给 scanf，然后转换为双精度变量或将 '%lf' 作为格式字符串传递给 scanf.

You are trying to scan a float with the '%f' token but providing a double. Pass in a float variable to scanf and then convert to a double or pass in '%lf' as the format string to scanf.