题解 | #求平均值#
求平均值
http://www.nowcoder.com/practice/c44b98aeaf9942d3a61548bff306a7de
awk '{if(NR>1) {sum+=$1;cn+=1}} END{printf("%.3f\n",sum/cn)}' nowcoder.txt #awk '{print NR,$1}' nowcoder.txt #awk '{if(NR==1) {N=$1} else{sum+=$1}} END{printf ("%.3f",sum/N) }'