C语言编一个程序求 1+12+123+1234+。。。+N(0〈N〈10)答:include"stdio.h"void main(){ int a[9]={1,12,123,1234,12345,123456,1234567,12345678,123456789};int n,ans=0;printf("Input a number N(0<N<10):");scanf("%d",&n);while(n<=0||n>=10){ printf("A wrong number ! Input N again :");scanf("%d",&n);} for(int i=...