#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 l2=sizeof(data2)/sizeof(data2[0]);
    int l1=sizeof(data1)/sizeof(data1[0]);
	cat_data(data1,data2,l2);
	for(int i=0;i<l1;i++){
		printf("data1[%d]=%d\n",i,data1[i]);
	}
	return 0;
}
 
void cat_data(int*data1,const int*data2,int len2){
	int count;
	while(*data1){
		data1++;
	}
	for(int i=0;i<len2;i++){
		*data1++=*data2++;
	}
}

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