Compilare: main.c: In function 'main': main.c:10:5: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets(A, len, fin); ^~~~~~~~~~~~~~~~~~ main.c:11:5: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets(B, len, fin); ^~~~~~~~~~~~~~~~~~