#include <stdio.h>
 
void cat_data(int *data1,const int *data2,int len2);
 
int main(void) {
 
	int data1[7] = {1,2,0,0,0,0,0};
	int data2[5] = {3,5,4,7,6};
	int len2 = 5;
	int i;
 
	cat_data(data1,data2,len2);
 
	for(int i = 0;i < 7;i ++){
		printf("data1[%d] = %d\n",i+1,data1[i]);
	}
 
	return 0;
}
 
void cat_data(int *data1,const int *data2,int len2){
 
	int i;
	int len1 = 0;
 
	while(data1[len1] != 0){
		len1 ++;
	}
 
	for(i = 0;i < len2; i ++){
		data1[len1 + i] = data2[i];
	}
}

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