Compilare: user.cpp: In function ‘int main()’: user.cpp:10:19: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[100]’ [-Wformat=] fscanf(f,"%s",&s1); ^ user.cpp:11:19: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[100]’ [-Wformat=] fscanf(f,"%s",&s2); ^ user.cpp:53:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<=strlen(s)-1;i++) ^ user.cpp:10:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s",&s1); ^ user.cpp:11:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s",&s2); ^ user.cpp:16:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld",&n); ^ user.cpp:19:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld",&x); ^