Compilare: user.cpp: In function ‘void CountingSort(unsigned int*, unsigned int*, unsigned int)’: user.cpp:13:62: warning: operation on ‘i’ may be undefined [-Wsequence-point] for(; i != 0x800; index[++i] = index[~-i] + frequence[~-i]); ^ user.cpp:13:62: 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] < 0x30 | inBuffer[p] > 0x39) ^ user.cpp:29:23: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] while(inBuffer[p] > 0x2F & inBuffer[p] < 0x3A) ^ 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:18:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void read(unsigned int &num) ^ user.cpp:7:37: 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:26:23: 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:33:23: 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:61:38: 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); ^ In file included from /usr/include/stdio.h:936:0, from /usr/include/c++/5/cstdio:42, from user.cpp:1: In function ‘size_t fread(void*, size_t, size_t, FILE*)’, inlined from ‘void read(unsigned int&)’ at user.cpp:26:23: /usr/include/x86_64-linux-gnu/bits/stdio2.h:293:71: warning: call to ‘__fread_chk_warn’ declared with attribute warning: fread called with bigger size * nmemb than length of destination buffer return __fread_chk_warn (__ptr, __bos0 (__ptr), __size, __n, __stream); ^ In function ‘size_t fread(void*, size_t, size_t, FILE*)’, inlined from ‘void read(unsigned int&)’ at user.cpp:33:23: /usr/include/x86_64-linux-gnu/bits/stdio2.h:293:71: warning: call to ‘__fread_chk_warn’ declared with attribute warning: fread called with bigger size * nmemb than length of destination buffer return __fread_chk_warn (__ptr, __bos0 (__ptr), __size, __n, __stream); ^ In function ‘size_t fread(void*, size_t, size_t, FILE*)’, inlined from ‘void read(unsigned int&)’ at user.cpp:26:23, inlined from ‘int main()’ at user.cpp:63:12: /usr/include/x86_64-linux-gnu/bits/stdio2.h:293:71: warning: call to ‘__fread_chk_warn’ declared with attribute warning: fread called with bigger size * nmemb than length of destination buffer