Compilare: user.c: In function ‘main’: user.c:8:13: warning: unused variable ‘a’ [-Wunused-variable] int t,b,a; ^ user.c:8:11: warning: unused variable ‘b’ [-Wunused-variable] int t,b,a; ^ user.c: In function ‘gcd’: user.c:6:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:12:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&t); ^ user.c:17:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&(buffer[j])); ^ user.c:18:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&(buffer[j+1])); ^