C++蛇形数组（数字倒三角）

#include <iostream> #include <fstream> using namespace std; int main() { //ifstream fin("d:\\test2.txt"); ofstream fout("d://test2.txt");//打开文件 int a[30][30];//定义一个二为数组 int i,j,k=2,count; int lines; cout<<"enter the line:"; cin>>lines; k=lines; for(i=0;i<lines;i++) { count=i+2; a[i][0]=(i*(i+1))/2+1; cout<<a[i][0]<<"\t"; fout<<a[i][0]<<' '; for(j=1;j<k;j++) { a[i][j]=a[i][j-1]+count; cout<<a[i][j]<<"\t"; //fin>>a[i][j]; fout<<a[i][j]<<' ';//将数据写入文件 count++; } fout<<endl; k=k-1; cout<<endl; } return 0; }