#include <stdio.h>
 
#define PLUS 1 // メソッドとして使うためにマクロを定義する
#define MINUS 2 // 上に同じ。こちらは引き算のメソッドで、上のが足し算メソッド
 
int object (int method,int valuea,int valueb);
 
int main(int argc, const char * argv[])
{
    int valuea = 0; //数値A
    int valueb = 0; //数値B
    int command = 0; //コマンド
    int anser = 0; //答え
 
    printf("数値Aを入力してね\n");
    scanf("%d",&valuea); //数値Aに代入
    printf("\n数値Bを入力してね\n");
    scanf("%d",&valueb); //数値Bに代入
    printf("\n実行する計算のコマンドを入力してね\n");
    printf("たしざん==1 引き算==2\n");
    scanf("%d",&command); //変数commandに代入
 
    if (command == 1) anser = object(PLUS, valuea,valueb);//コマンドが１ならばobject関数に足し算をするようにメソッドを送る
    else if (command == 2) anser = object(MINUS, valuea, valueb);//コマンドが2ならばobject関数に引き算をするようにメソッドを送る
    //object関数から帰ってきた計算の答えを変数anserに代入する
 
    printf("\n答えは%dになりましたとさ。",anser); //答えが入っている変数anserを標準出力
 
    return 0;
}
 
int object (int method,int valuea,int valueb){
 
    int anser = 0; //答えを格納する変数anser
 
    switch (method) {
            //変数methodにより処理を変える
        case PLUS: //もしmethodがマクロPLUS(１)なら
            anser = valuea + valueb; //数値AとBを足して変数anserに代入
            break;
        case MINUS: //もしmethodがマクロMINUS(2)なら
            anser = valuea - valueb; //数値AからBを引いて変数anserに代入
        default:
            printf("\nえらー\n"); //えらー処理
            break;
    }
 
    return anser; //計算の答えが格納されている変数anserを返す
}

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