In the definition,double d[10] = {0.0};only d[0] is initialized to zero,the rest are uninitialized,just like x in the definition double x;

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In the definition `double d[10] = {0.0};`, not only is `d[0]` initialized to zero, but all elements in the array are implicitly initialized to zero. This is a feature of C and C++ where if an array is partially initialized, the rest of the elements are automatically initialized to zero.

In the Definition,double D[10] = {0