Why does the statement char *str = 'Hello'; work, but not int *i = 10;?

For char *str = "Hello", pointer "str" will point to a location where constant string "Hello" is stored.

For int *i = 10, i is an integer pointer pointing to memory location 10. Applications in Windows/Linux runs in protected mode making the location inaccessible from any application. Thus writing some value to this memory location (*i = some value) will cause a core dump or application crash.

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