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

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