Compilare: main.c: In function 'main': main.c:6:31: warning: unused variable 'j' [-Wunused-variable] int a,b,x,y,r,rez,m=2,i,n,j; ^ main.c:6:23: warning: unused variable 'm' [-Wunused-variable] int a,b,x,y,r,rez,m=2,i,n,j; ^ main.c:12:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf (f_in,"%d",&n); ^~~~~~~~~~~~~~~~~~~~~ main.c:16:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f_in,"%d%d",&a,&b); ^~~~~~~~~~~~~~~~~~~~~~~~~