C :

#include <stdio.h>
void copy(char *pa,char *pb);
int main(void)
{
	char a[80],b[80];
	gets(a);
	printf("OldString=%s",a);
	copy(a,b);
	printf("\nNewString=%s",b);
	return 0;
}
void copy(char *pa,char *pb)
{
	while(*pa != '\0')
	{
		*pb=*pa;
		pa++;
		pb++;
	}
	*pb='\0';
}

C++ :

#include<bits/stdc++.h>
using namespace std;
int main()
{
	char s1[80];
	cin>>s1;
	char *s2 = new char[strlen(s1)+1];
	strncpy(s2,s1,strlen(s1));
	cout<<"OldString=" << s1 << endl;
	cout<<"NewString="<< s2 << endl;
	delete []s2;
	return 0;
}