While coding with Japanese and showing results on screen, it seems to change to Simplify or Traditional Chinese. How can I set it to display in Japanese?
Original code:

```
#include <stdio.h>
main (void)
{
    int a[5] = {100,200,300,400,500};
    int ban, suu;
    printf("商品番号:");
    scanf("%d", &ban);
    printf("数量");
    scanf("%d", &suu);

    while (suu)
    {
        printf("金額=%d円\n", a[ban]*suu);
        printf("商品番号:");
        scanf("%d", &ban);
        printf("数量:");
        scanf("%d", &suu);
    }
return 0;

}

```

Here written in Japanese, and my PC support Japanese letters (bought in Japan). When showing result, it turns to this:

```
蝠・刀逡ｪ蜿ｷ:1
謨ｰ驥20
城≡鬘・4000蜀・
蝠・刀逡ｪ蜿ｷ:  

```