Compilare: user.cpp: In function ‘int main()’: user.cpp:37:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int p=0;p<strlen(user[i].postari[j]);p++) ^ user.cpp:40:41: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] { cuv[nr]=NULL; ^ user.cpp:57:20: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] cuv[nr]=NULL; ^ user.cpp:60:104: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] { for(int l=strlen(user[i].postari[j])-nr+1;l<strlen(user[i].postari[j]);l++) ^ user.cpp:67:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(founduser) ^ user.cpp:14:13: warning: unused variable ‘k1’ [-Wunused-variable] { int n,k,k1; ^