for some reason decides to be whatever value it want's despite the fact that it is in a for loop.
This means it is reading from uninitialized memory. Common reasons for this:
You declared a variable, or dynamically allocated memory, but never initialized the memory with a value.
You are using a pointer (or reference) to either a position in memory which has already been freed (dangling pointer/reference), or which has never been allocated (wild pointer/reference). This can happen with either the heap or the stack; it's not limited to dynamic allocation.
You are exceeding the boundaries of an array or string (buffer overrun).
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This means it is reading from uninitialized memory. Common reasons for this:
You declared a variable, or dynamically allocated memory, but never initialized the memory with a value.
You are using a pointer (or reference) to either a position in memory which has already been freed (dangling pointer/reference), or which has never been allocated (wild pointer/reference). This can happen with either the heap or the stack; it's not limited to dynamic allocation.
You are exceeding the boundaries of an array or string (buffer overrun).