Fix: initialize variable gamma to prevent undefined behavior in lattice_change_cg.cpp (#7038)

PKUJZX · mohanchen · web-flow · commit eb1665cde9da · 2026-03-19T08:12:32.000+08:00
Co-authored-by: Mohan Chen &lt;mohanchen@pku.edu.cn&gt;
diff --git a/source/source_relax/lattice_change_cg.cpp b/source/source_relax/lattice_change_cg.cpp
@@ -279,7 +279,7 @@ void Lattice_Change_CG::setup_cg_grad(double *grad,
 {
     ModuleBase::TITLE("Lattice_Change_CG", "setup_cg_grad");
     assert(Lattice_Change_Basic::stress_step > 0);
-    double gamma;
+    double gamma = 0.0;
     double cg0_cg, cg0_cg0, cg0_g;
 
     if (ncggrad % 10000 == 0 || flag == 2)

Original file line number	Diff line number	Diff line change
`@@ -279,7 +279,7 @@ void Lattice_Change_CG::setup_cg_grad(double *grad,`
`279`	`279`	`{`
`280`	`280`	`ModuleBase::TITLE("Lattice_Change_CG", "setup_cg_grad");`
`281`	`281`	`assert(Lattice_Change_Basic::stress_step > 0);`
`282`		`- double gamma;`
	`282`	`+ double gamma = 0.0;`
`283`	`283`	`double cg0_cg, cg0_cg0, cg0_g;`
`284`	`284`
`285`	`285`	`if (ncggrad % 10000 == 0 \|\| flag == 2)`