Type specifier for double in printf

printf() can use either %f or %lf. printf is transmitted by converting float to double before receiving float There are two format specifiers for double instead of no format specifiers for float.

However, this applies only to outputs such as printf() and not to inputs such as scanf and fscanf. In the input, %f means to read float, %lf means to read %Lf, and %Lf means to read long double