#include<stdio.h>
 
void cat_data(int *data1, const int *data2, int len2);
 
int main(void)
{
int n1[7] = {1,2};
int n2[5] = {3,4,5,6,7};
int l1 = sizeof(n1) / sizeof(n1[0]);
int l2 = sizeof(n2) / sizeof(n2[0]);
 
cat_data(n1, n2, l2);
 
for(int i=0; i<l1; i++){
printf("data1[%d] = %d\n", i, n1[i] );
}
 
return 0;
}
 
void cat_data(int *data1, const int *data2, int len2)
{
while(*data1){
data1++;
}
 
while(len2--){
*data1++ = *data2++;
}
}

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