Compilare: main.cpp: In function 'int main()': main.cpp:18:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<strlen(s); i++) { ~^~~~~~~~~~ main.cpp:14:10: warning: unused variable 'c' [-Wunused-variable] char c=fgetc(pf); ^ main.cpp:13:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(pf, "%[^\n]", s); ^ main.cpp:15:28: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s2, MAX_SIZE, pf); ^