#include <stdio.h>
 
void cat_data(int *data1,const int *data2,int len2);
 
int main(){
    int data1[7]={1,2,3,4,5,6,7};
    int data2[5]={3,4,5,6,7};
	int data3[12]={0};
    int len2=sizeof(data1)/sizeof(data1[0]);
 
    cat_data(data1, data2, len2);
 
    for(int i=0;i<len2;i++){
        printf("data1[%d] = %d\n", i, data2[i]);
    }
    return 0;
}
 
void cat_data(int *data1,const int *data2,int len2){
    for(int i=0;i<len2;i++){
        data1[i]=data2[i];
    }
}

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