Compilare: user.cpp: In function ‘void CountingSort(unsigned int*, unsigned int*, unsigned int)’: user.cpp:12:29: warning: operation on ‘i’ may be undefined [-Wsequence-point] for(; i != 0x800; index[++i] = index[~-i] + frequence[~-i]); ^~~ user.cpp:12:29: warning: operation on ‘i’ may be undefined [-Wsequence-point] user.cpp: In function ‘void read(unsigned int&)’: user.cpp:23:23: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] while(inBuffer[p] < 0x30 | inBuffer[p] > 0x39) ~~~~~~~~~~~~^~~~~~ user.cpp:28:23: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] while(inBuffer[p] > 0x2F & inBuffer[p] < 0x3A) ~~~~~~~~~~~~^~~~~~ user.cpp: At global scope: user.cpp:38:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void itoa(unsigned int x) ^~~~ user.cpp:17:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void read(unsigned int &num) ^~~~ user.cpp:6:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void CountingSort(unsigned int A[], unsigned int B[], unsigned int digit) ^~~~~~~~~~~~ user.cpp: In function ‘void read(unsigned int&)’: user.cpp:25:23: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] ++p != 0x8000 || (fread(inBuffer, 0x1, 0x8000, stdin), p = 0x0); ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp:32:23: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] ++p != 0x8000 || (fread(inBuffer, 0x1, 0x8000, stdin), p = 0x0); ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:60:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.in", "r", stdin); ^ user.cpp:61:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.out", "w", stdout); ^