#include <stdio.h>
 
void cat_data(int *data1,const int *data2,int len2);
 
int main() {
  int data1[7]={8,7,6,9};
  int data2[5]={4,5};
  int i;
 
  int len1 = sizeof(data1)/sizeof(data1[0]);
  int len2 = sizeof(data2)/sizeof(data2[0]);
 
  cat_data(data1,data2,len2);
 
  for(i=0; i<len1; i++){
  printf("data1[i]= %d \n",data1[i]);
  }
 
  return 0;
}
 
void cat_data(int *data1,const int *data2,int len2){
 
  while(*data1){
    data1++;
  }
 
  for(int i=0; i<len2; i++){
    *data1++=data2[i];
    }
}
 
 

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