#include <stdio.h>
 
void cat_data(int *data1, const int *data2, int len2)
{
    int i;
    // data1 の末尾(今回7個)の後ろに data2 をコピーする
    for (i = 0; i < len2; i++) {
        data1[7 + i] = data2[i];
    }
}
 
int main(void)
{
    int data1[12] = {1, 2, 3, 4, 5, 6, 7};      // 元の 7 個
    int data2[5] = {8, 9, 10, 11, 12};         // 後ろに連結する 5 個
 
    int len2 = sizeof(data2) / sizeof(data2[0]);   // 配列の長さを求める
 
    cat_data(data1, data2, len2);
 
    // 連結後の data1 を出力
    for (int i = 0; i < 12; i++) {
        printf("%d ", data1[i]);
    }
    printf("\n");
 
    return 0;
}
 

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