#include <stdio.h>
 
#define LEN1 7
#define LEN2 5
 
// data1 に data2 を連結する関数
void cat_data(int *data1, const int *data2, int len2) {
    // data1 の現在のデータ数を調べる（0を空きとみなす）
    int count1 = 0;
    while (count1 < LEN1 && data1[count1] != 0) {
        count1++;
    }
 
    // data2 を data1 の空きにコピー（LEN1 を超えない範囲で）
    for (int i = 0; i < len2 && count1 < LEN1; i++) {
        data1[count1] = data2[i];
        count1++;
    }
}
 
int main(void) {
    // 初期値（例）：data1 に3つだけ値を入れて残りは空き
    int data1[LEN1] = {1, 2, 3, 0, 0, 0, 0};
    int data2[LEN2] = {4, 5, 6, 7, 8};
 
    cat_data(data1, data2, LEN2);
 
    // 結果を出力
    for (int i = 0; i < LEN1; i++) {
        printf("%d ", data1[i]);
    }
    printf("\n");
 
    return 0;
}
 

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