#include <stdio.h>
 
void cat_data(int *data1, const int *data2, int len2) {
    for (int i = 0; i < len2; i++) {
        data1[2 + i] = data2[i];
    }
}
 
int main(void) {
    int data1[7] = {1, 2, 0, 0, 0, 0, 0};     
    int data2[5]  = {8, 9, 10, 11, 12};
 
    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;
}
 

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