Compilare: user.c: In function ‘gcd’: user.c:4:5: warning: type of ‘a’ defaults to ‘int’ [enabled by default] int gcd(a,b) ^ user.c:4:5: warning: type of ‘b’ defaults to ‘int’ [enabled by default] user.c: In function ‘main’: user.c:44:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.c:49:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&a); ^ user.c:50:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&b); ^