Compilare: user.cpp: In function ‘int main()’: user.cpp:8:9: warning: unused variable ‘n’ [-Wunused-variable] double n = cifre(file2); ^ user.cpp: In function ‘double cifre(FILE*)’: user.cpp:24:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file, "%d", &a); ^ user.cpp:25:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file, "%lf", &b); ^ user.cpp:26:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file, "%d", &c); ^ user.cpp:27:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file, "%d", &k); ^