Compilare: user.cpp: In function ‘int prelucrare()’: user.cpp:12:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(strlen(s3)>imax){ ^ user.cpp:29:25: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] s3[strlen(s3)-1]=NULL; ^ user.cpp: In function ‘int main()’: user.cpp:49:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(a[i])<imin){ ^ user.cpp:57:21: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] s3[strlen(s1)-1]=NULL; ^ user.cpp:73:29: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] s2[strlen(s2)-1]=NULL; ^