c++ - Stack around variable was corrupted (Converting long long to byte array) -

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when gets end of function, bombs "stack around variable corrupted" variable keybytes2. not sure missing why problem. using nvcc compiler.

char keybytes2[7]; long long unsigned lkey;  lkey = 32428228256948131;  //convert long long byte array (int = 0; < 8; ++i) {     keybytes2[i] = ((lkey) >> 8 * i) & 0xffu; } 

char keybytes2[7];

this allocates 7 bytes, not 8. in loop access keybytes2[7], i.e. eighth byte of array. out-of-range access , undefined behavior.


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