Compilare: user.cpp: In function ‘int main()’: user.cpp:28:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d %d",&n,&m,&k,&e); ^ user.cpp:32:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&val); if (val==1) { fscanf(f,"%d %d %d %d",&x,&y,&sec,&en); ^ user.cpp:32:82: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&val); if (val==1) { fscanf(f,"%d %d %d %d",&x,&y,&sec,&en); ^ user.cpp:34:71: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] else if (val==2) {fscanf(f,"%d %d %d %d %d",&x,&y,&sec,&en,&v); ^