Compilare: main.cpp: In function 'int main()': main.cpp:26:24: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] s1[strlen(s1)-1] = NULL; //elimin spatiul ^~~~ main.cpp:27:24: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] s2[strlen(s2)-1] = NULL; ^~~~ main.cpp:28:24: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] s3[strlen(s3)-1] = NULL; ^~~~ main.cpp:22:27: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s1, NMAX-3, fin); ^ main.cpp:23:27: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s2, NMAX-3, fin); ^ main.cpp:24:27: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s3, NMAX-3, fin); ^