The output of MD with OFDFT is hexadecimal

[sunliang98]

Describe the bug

When running MD with OFDFT, for example tests/integrate/920_OF_MD_LDA, the output on the screen is hexadecimal after the first ion step:

---

STEP OF MOLECULAR DYNAMICS : 1

============================== Running OFDFT ==============================
Iter Etot(Ha) Mu(Ha) Theta PotNorm deltaE(Ha)
0 -0x1.064a92506c435p+3 0x1.3a12bbb7c5bd5p-20x1.999999999999ap-30x1.a7691fbc10e43p-30x1.45de87390732p-2
1 -0x1.0862de7f6e897p+3 0x1.34096b50fb5b1p-20x1.e99cff841acd8p-50x1.dfa32827b3271p-3-0x1.0c261781231p-4
2 -0x1.105007225b77ap+3 0x1.1df1a64cba103p-20x1.01c89b4416a8dp-40x1.703f72dba7b45p-5-0x1.fb4a28bb3b8cp-3
3 -0x1.1077c36f169a2p+3 0x1.1d50b28602563p-20x1.0f06feb865a3cp-70x1.e033d0a3ce699p-8-0x1.3de265d914p-8
4 -0x1.1078e5e74461fp+3 0x1.1d47ec6202319p-20x1.c64c4a3626301p-100x1.37940de0e9e91p-10-0x1.22782dc7dp-13
5 -0x1.1078ed90c161ep+3 0x1.1d46f789e1052p-20x1.20298952c1de6p-120x1.63531d0536bf4p-12-0x1.ea5f3ffcp-19
6 -0x1.1078ee27cc672p+3 0x1.1d473e15a42d7p-20x1.c8068a136966cp-140x1.bd17a759422b2p-15-0x1.2e160a8p-22
7 -0x1.1078ee2ba5db8p+3 0x1.1d474a38d2145p-20x1.28a9baceff18dp-160x1.15e5c569f4c83p-17-0x1.ecba3p-28

Expected behavior

No response

To Reproduce

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Environment

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Additional Context

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[mohanchen]

need unit tests in future

[sunliang98]

need unit tests in future

OK