Compilare: user.c: In function ‘lastDigitPow’: user.c:48:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:74:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d",&t); ^~~~~~~~~~~~~~~~~~ user.c:77:9: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(n,121,fi); ^~~~~~~~~~~~~~~