Compilare: user.cpp: In function ‘bool check(float)’: user.cpp:36:11: warning: unused variable ‘a’ [-Wunused-variable] float a, b; ^ user.cpp:36:14: warning: unused variable ‘b’ [-Wunused-variable] float a, b; ^ user.cpp: In function ‘int main()’: user.cpp:76:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d\n", &n, &k); ^ user.cpp: In function ‘float read(FILE*)’: user.cpp:19:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c", &c); ^ user.cpp:20:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] while(!isdigit(c)) fscanf(f, "%c", &c); ^ user.cpp:22:62: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] while(isdigit(c)) nr=nr*10 + c - '0', fscanf(f, "%c", &c); ^ user.cpp:26:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c", &c); ^ user.cpp:27:72: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] while(isdigit(c)) fr=fr*10 + c -'0', z*=10, fscanf(f, "%c", &c); ^