Compilare: user.c: In function ‘win_lose’: user.c:24:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.c:24:9: warning: unused variable ‘i’ [-Wunused-variable] int i, j; ^ user.c: In function ‘main’: user.c:107:23: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&a[i][j]); ^ user.c:113:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"\n"); ^