Compilare: user.cpp: In function ‘void read(int&)’: user.cpp:13:23: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] while(buffer[pos] < 48 | buffer[pos] > 57) ^ user.cpp:22:23: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] while(buffer[pos] > 47 & buffer[pos] < 58) ^ user.cpp: At global scope: user.cpp:52:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^ user.cpp: In function ‘int main()’: user.cpp:54:38: 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:60:40: 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); ^ user.cpp: In function ‘void read(int&)’: user.cpp:17:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, bufferSize, stdin); ^ user.cpp:28:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, bufferSize, stdin); ^