二维数组基础练习1

#include <iostream>

using namespace std;

int main()
{
int i,j;
int a[5][4]= {{0,1},{4,5},{8,9},{12,13},{16,17}};
cout<<"请输入10个整数："<<endl;
for(i=0; i<=4; i++)
for(j=2; j<=3; j++)
{
cin>>a[i][j];
}
cout<<"数组中的值为："<<endl;
for(i=0; i<=4; i++)
{
for(j=0; j<=3; j++)
cout<<a[i][j]<<" ";
cout<<"\n";
}
cout<<"现在将所有元素乘以3"<<endl;
for(i=0; i<=4; i++)
{
for(j=0; j<=3; j++)
a[i][j]*=3;
}
cout<<"行序优先输出："<<endl;
for(i=0; i<=4; i++)
{
for(j=0; j<=3; j++)
{
cout<<a[i][j]<<" ";
}
cout<<endl;
}
cout<<"列序优先输出："<<endl;
for(j=0; j<=3; j++)
{
for(i=0; i<=4; i++)
{
cout<<a[i][j]<<" ";
}
cout<<endl;
}
cout<<"倒着输出："<<endl;
for(i=4; i>=0; i--)
{
for(j=3; j>=0; j--)
{
cout<<a[i][j]<<" ";
}
cout<<"\n";
}
cout<<"数组中的所有偶数："<<endl;
for(i=0; i<=4; i++)
{
for(j=0; j<=3; j++)
{
if(a[i][j]%2==0)
cout<<a[i][j]<<" ";
}
cout<<endl;
}
cout<<"行列下标之和为3的倍数的元素："<<endl;
for(i=0; i<=4; i++)
for(j=0; j<=3; j++)
{
if((i+j)%3==0)
cout<<a[i][j]<<" ";
}
cout<<endl;
return 0;
}