Compilare: user.cpp: In function ‘int main()’: user.cpp:26:31: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[101]’ [-Wformat=] fscanf(f, "%s\n%s\n", &a, &b); ^ user.cpp:26:31: warning: format ‘%s’ expects argument of type ‘char*’, but argument 4 has type ‘char (*)[101]’ [-Wformat=] user.cpp:34:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < strlen(a); j++) ^ user.cpp:38:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < strlen(b); j++) ^ user.cpp:22:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d\n", &t); ^ user.cpp:26:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%s\n%s\n", &a, &b); ^