Compilare: user.cpp: In function ‘int main()’: user.cpp:16:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0, k = 0; i < strlen(sir2) && k < strlen(sir1);) ^ user.cpp:16:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0, k = 0; i < strlen(sir2) && k < strlen(sir1);) ^ user.cpp:13:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%s", sir1); ^ user.cpp:14:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%s", sir2); ^