Compilare: user.cpp: In function ‘int main()’: user.cpp:16:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int x=1;x<=strlen(linie);x++) ^ user.cpp:27:90: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] }while('0'<=linie[x]&&linie[x]<='9'&&x<=strlen(linie)); ^ user.cpp:48:78: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] }while('0'<=linie[x]&&linie[x]<='9'&&x<=strlen(linie)); ^ user.cpp:11:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&n,&m); ^ user.cpp:12:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%c",&ch); ^ user.cpp:15:35: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(linie+1,501,fin); ^ In file included from /usr/include/stdio.h:934:0, from user.cpp:1: In function ‘char* fgets(char*, int, FILE*)’, inlined from ‘int main()’ at user.cpp:15:35: /usr/include/i386-linux-gnu/bits/stdio2.h:253:58: warning: call to ‘__fgets_chk_warn’ declared with attribute warning: fgets called with bigger size than length of destination buffer [enabled by default] return __fgets_chk_warn (__s, __bos (__s), __n, __stream); ^