Compilare: main.cpp: In function 'void afis(int)': main.cpp:21:17: warning: suggest parentheses around '+' inside '<<' [-Wparentheses] if((1<<i+1)&x) ~^~ main.cpp:21:11: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if((1<<i+1)&x) ^ main.cpp: In function 'int main()': main.cpp:52:7: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(s[0]!='(') ^ main.cpp:30:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(iname,"r",stdin); ^ main.cpp:31:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(oname,"w",stdout); ^ main.cpp:32:29: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s,sizeof(s),stdin); ^ main.cpp:33:29: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s,sizeof(s),stdin); ^ main.cpp:50:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(iname,"r",stdin); ^ main.cpp:51:29: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s,sizeof(s),stdin); ^