Compilare: user.cpp: In function ‘void CountingSort(unsigned int*, unsigned int*, unsigned int)’: user.cpp:11:78: warning: operation on ‘i’ may be undefined [-Wsequence-point] for(unsigned int i = 0; i != 256; index[++i] = index[~-i] + frequence[~-i]); ^ user.cpp:11:78: warning: operation on ‘i’ may be undefined [-Wsequence-point] user.cpp: In function ‘void read(unsigned int&)’: user.cpp:24:23: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] while(inBuffer[p] < 48 | inBuffer[p] > 57) ^ user.cpp:29:23: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] while(inBuffer[p] > 47 & inBuffer[p] < 58) ^ user.cpp: At global scope: user.cpp:39:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void itoa(unsigned int x) ^ user.cpp:16:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void read(unsigned int &num) ^ user.cpp:5:37: 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:22:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(inBuffer, 1, 64, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:63:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radixsort.in", "r", stdin); ^ user.cpp:64:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radixsort.out", "w", stdout); ^ user.cpp: In function ‘void CountingSort(unsigned int*, unsigned int*, unsigned int)’: user.cpp:11:5: warning: iteration 255u invokes undefined behavior [-Waggressive-loop-optimizations] for(unsigned int i = 0; i != 256; index[++i] = index[~-i] + frequence[~-i]); ^ user.cpp:11:31: note: containing loop for(unsigned int i = 0; i != 256; index[++i] = index[~-i] + frequence[~-i]); ^