Compilare: user.c: In function ‘lastDigitPow’: user.c:45:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:62:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d",&t); ^~~~~~~~~~~~~~~~~~ user.c:64:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d",&n); ^~~~~~~~~~~~~~~~~~ user.c:59:13: warning: iteration 99 invokes undefined behavior [-Waggressive-loop-optimizations] v[i]=CalcLastDigitSum(i); ~~~~^~~~~~~~~~~~~~~~~~~~ user.c:58:5: note: within this loop for(i=1;i<=100;i++) ^~~