Bug for 107_PW_OD_outputdos

[Qianruipku]

Describe the Bug

Sometime, 107_PW_OD_outputdos cannot pass the autotest

To Reproduce

Steps to reproduce the behavior:
0. Download develop branch

1. Compile it with Makefile
2. Test 107_PW_OD_outputdos
3. Repeat until it shows ERROR:
   Sometimes it is OK:
   
   sometimes it is wrong:
   
   result.txt

Environment

• OS: Ubuntu16.04
• Compiler: oneapi2021
• Optional Dependencies: [e.g. Intel MKL]

Additional Context

Add any other context about the problem here.

[Qianruipku]

Compiling it with cmake will also repeat it.

[caic99]

Hi @Qianruipku ,
Similar cases have appeard before, see #637 .

[wenfei-li]

The reason behind this bug is that in calculating DOS_smearing, the program first takes the calculated DOS as input:

			 for(int i=0;i<number;i++)
			 {
				 in >> energy[i] >> dos[i];
			 }
			 if(!in.eof())
			 {
				 //std::cout<<"\n Read Over!"<<std::endl;
			 }
			 in.close();

This might have something to do with the input buffer. Also, it is bad practice to use the output file of the program as input file.
The way to fix this is to save the array that stores DOS and use that in calculating DOS_smearing, instead of reading from DOS.