Compilare: user.cpp: In function ‘int read(int&)’: user.cpp:15:21: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] while(buffer[p] < 48 | buffer[p] > 57) ^ user.cpp:19:21: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] while(buffer[p] > 47 & buffer[p] < 58) ^ user.cpp:25:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:30:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("exp.in", "r", stdin); ^ user.cpp:31:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("exp.out", "w", stdout); ^ user.cpp: In function ‘int read(int&)’: user.cpp:17:61: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++p == 8192) fread(buffer, 1, 8192, stdin), p = 0; ^ user.cpp:23:61: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++p == 8192) fread(buffer, 1, 8192, stdin), p = 0; ^