#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(data2)/sizeof(data2[0]);
 
	cat_data(data1,data2,len2);
 
	for(int i=0;i<7;i++){
		printf("data1[%d]=%d\n",i,data1[i]);
	}
	return 0;	
}
 
void cat_data(int *data1,const int *data2,int len2){
 
 
 
	while(*data1!=0){
		data1++;
	}
 
	while(len2>0){
		*data1++=*data2++;
		len2--;
	}
}
 

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