#include<stdio.h>
 
void cat_data( int *data1, const int *data2, int len2);
 
int main(void)
{
	int n1[7] = {1,2};
	int n2[5] = {3,4,5,6,7};
	int l1 = sizeof(n1) / sizeof(n1[0]);
	int l2 = sizeof(n2) / sizeof(n2[0]);
 
	cat_data( n1, n2, l2);
 
	for(int i=0; i<l1; i++){
		printf("cat_data[%d] = %d\n", i+1, n1[i]);
	}
 
	return 0;
}
void cat_data( int *data1, const int *data2, int len2)
{
while(*data1){
	data1++;
}
while(len2){
	*data1 = *data2;
	data1++;
	data2++;
	len2--;
}
}

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