#include <stdio.h>
 
// data1の後ろにdata2を連結する関数
void cat_data(int *data1, const int *data2, int len2)
{
    int i;
    for (i = 0; i < len2; i++) {
        data1[2 + i] = data2[i];   // data1の後ろにdata2をコピー
    }
}
 
int main(void)
{
    int data1[7] = {1, 2};              // 最初は2個のみ値が入っている
    int data2[5] = {3, 4, 5, 6, 7};
 
    // sizeof演算子でdata2の長さを求める
    int len2 = sizeof(data2) / sizeof(data2[0]);
 
    // 連結処理
    cat_data(data1, data2, len2);
 
    // 連結後のdata1を出力
    for (int i = 0; i < 7; i++) {
        printf("data1[%d] = %d\n", i, data1[i]);
    }
 
    return 0;
}
 
 

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