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