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

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