Compilare: user.c: In function ‘main’: user.c:17:4: warning: this ‘else’ clause does not guard... [-Wmisleading-indentation] else ^~~~ user.c:19:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘else’ return 0; ^~~~~~ user.c:5:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmmdc.in","r",stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:6:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmmdc.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:7:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a); ^~~~~~~~~~~~~~ user.c:8:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&b); ^~~~~~~~~~~~~~