[例題の為の例題]入力'1','2','A','B'を16進12ABにせよ!!!(オンラインコンパイラ)

いろいろ注意

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プログラム

• オンラインコンパイラ

//0 1 2 3 4 5 6 7 8 9 A B C D E F
char t[] = {
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, //00
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, //10
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, //20
0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0, //30

0,10,11,12,13,14,15,0,0,0,0,0,0,0,0,0, //40
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, //50
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, //60
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, //70

0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, //80
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, //90
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, //A0
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, //B0

0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, //C0
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, //D0
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, //E0
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0  //F0
};

#include <iostream>
using namespace std;
int main(void){
    // Your code here!
    
    unsigned char p[4];
    
    p[0] = '1';
    p[1] = '2';
    p[2] = 'A';
    p[3] = 'B';


    int g = 0;
    for(int i=0;i<4;i++){
        
       int a = p[i];
       g = (g << 4) + t[a];
       
    }  //for 
    
    printf("%X\n",g);
    
}  //main

12AB