Compilare: user.c: In function ‘main’: user.c:61:5: warning: implicit declaration of function ‘close’ [-Wimplicit-function-declaration] close(fin); ^~~~~ user.c:43:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &T); ^~~~~~~~~~~~~~~~~~~~~ user.c:47:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &D); ^~~~~~~~~~~~~~~~~~~~~ user.c:48:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &A); ^~~~~~~~~~~~~~~~~~~~~ user.c:49:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &B); ^~~~~~~~~~~~~~~~~~~~~ user.c:50:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &C); ^~~~~~~~~~~~~~~~~~~~~ user.c:51:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &E); ^~~~~~~~~~~~~~~~~~~~~