配列の初期化状況とインデックスとインクリメントの関係の確認

arrayAndIndex.c

// This file is a "Hello, world!" in C language by gcc for wandbox.
#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    int array[5];
    int arrayB[5];
    int i=0;

    array[i++]=123;
    arrayB[i] = -1;

    for(int j = 0; j <5; j++ ) {
        printf("array[%d] = %d\n", j, array[j]);
        printf("arrayB[%d] = %d\n", j, arrayB[j]);
    }
    return EXIT_SUCCESS;
}

// GCC reference:
//   https://gcc.gnu.org/

// C language references:
//   https://msdn.microsoft.com/library/fw5abdx6.aspx
//   https://www.gnu.org/software/gnu-c-manual/