vector merging

What did I do wrong here I want to merge 2 vectors to 1 vector, and order them from the smallest number to the biggest.
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 #include<iostream>
using namespace std;
int main()
{
	int a[3],b[3],c[6],i,j,g;
	cout<<"fut a\n";
		for(i=0;i<3;i++)
		cin>>a[i];
	cout<<"fut b\n";
		for(i=0;i<3;i++)
			cin>>b[i];
		for(i=0;i<3;i++)
			c[i]=a[i];
		for(i=0;i<3;i++)
			c[i+3]=b[i];
		
		for(i=0;i<6;i++)
		{
			for(j=i+1;j<6;j++)
			{
				if(c[i]<c[j])
				{
					g=c[i];
					c[i]=c[j];
					c[j]=g;
				}
			}
		}
		for(i=0;i<6;i++)
			cout<<endl<<a[i]<<" ";
		cout<<endl;
		return 0;
}
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thank you.
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