Valgrind的 - 错误

Question

下面是当我在Valgrind的运行我的代码

1）未初始化值由堆栈分配 ==在0x400EC1 16808 ==创建我得到的消息：的init（）（Hite.cpp： 90）

2）大小的无效读8

xmin=0.000000, xmax=1.000000, dx=0.010000, dt=0.000208, c=3.000000 
==2763== Conditional jump or move depends on uninitialised value(s) 
==2763== at 0x3E5420E836: __ieee754_exp (in /lib64/libm-2.12.so) 
==2763== by 0x3E54224A81: exp (in /lib64/libm-2.12.so) 
==2763== by 0x400F88: init() (Hite.cpp:96) 
==2763== by 0x4010C8: main (Hite.cpp:114) 
==2763== Uninitialised value was created by a stack allocation 
==2763== at 0x400EC1: init() (Hite.cpp:90) 
==2763== 
==2763== Use of uninitialised value of size 8 
==2763== at 0x3E5420E8EC: __ieee754_exp (in /lib64/libm-2.12.so) 
==2763== by 0x3E54224A81: exp (in /lib64/libm-2.12.so) 
==2763== by 0x400F88: init() (Hite.cpp:96) 
==2763== by 0x4010C8: main (Hite.cpp:114) 
==2763== Uninitialised value was created by a stack allocation 
==2763== at 0x400EC1: init() (Hite.cpp:90) 

我们如何从上而产生

90 void init() { 
91   double xmin=0; 
92  double xavg = 0.5*(xmin+xmax); 


int main(int argc,char **argv) { 
112  printf("xmin=%f, xmax=%f, dx=%f, dt=%f, c=%f\n", 
113      xmin=0,xmax=0,dx=0,dt=0,c=0); 
114  init() 

来这些错误

;

Answer 1

这将有助于看到的代码，但是从它的外观所创建的堆栈上未初始化的对象：

double val; 

你应该改变它是

double val = double(); 

或

double val(0); 

（我假设为double根据大小;它也可以是long long或某种其他类型的尺寸8）。