#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;
}
	 cat_data(int*data1,const int*data2,int len2){
	 	int len1=7-len2;
 
	 	for(int i=0;i<len2;i++){
	 		data1[len1+i]=data2[i];
	 	}
	 }

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