#include <stdio.h>
 
 
void cat_data(int *data1, const int *data2, int len2) {
 
    int data1_initial_length = 2; 
 
 
    for (int i = 0; i < len2; i++) {
        data1[data1_initial_length + i] = data2[i];
    }
}
 
int main(void) {
 
    int data1[7] = {1, 2}; 
    int data2[5] = {3, 4, 5, 6, 7}; 
 
 
    int len2 = sizeof(data2) / sizeof(data2[0]);
 
    printf("data2の要素数%d\n", len2);
    printf("連結前data1\n");
    for (int i = 0; i < 7; i++) {
        printf("data1[%d] = %d\n", i, data1[i]);
    }
    printf("\n");
 
    cat_data(data1, data2, len2);
 
 
    printf("連結後のdata1\n");
 
    for (int i = 0; i < 7; i++) {
        printf("data1[%d] = %d\n", i, data1[i]);
    }
 
 
    return 0;
}

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