Compilare: user.c: In function ‘main’: user.c:34:21: warning: left-hand operand of comma expression has no effect [-Wunused-value] for(i=1, j=N; i<=N/2, j>=N/2; i++, j--){ ^ user.c:31:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lld", &N); ^ user.c:32:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lld", &K); ^