#include <stdio.h>

int asctohex(char h);

int main(){
    printf("%d",asctohex('A')); //Passing asctohex any ascii character will give you back the interger HEX value
    return 0;
}

int asctohex(char h){
    if(h == '0'){
       return 0;
    }
    else if(h == '1'){
       return 1;
    }
    else if(h == '2'){
       return 2;
    }
    else if(h == '3'){
       return 3;
    }
    else if(h == '4'){
       return 4;
    }
    else if(h == '5'){
       return 5;
    }
    else if(h == '6'){
       return 6;
    }
    else if(h == '7'){
       return 7;
    }
    else if(h == '8'){
       return 8;
    }
    else if(h == '9'){
       return 9;
    }
    else if(h == 'A'){
       return 10;
    }
    else if(h == 'B'){
       return 11;
    }
    else if(h == 'C'){
       return 12;
    }
    else if(h == 'D'){
       return 13;
    }
    else if(h == 'E'){
       return 14;
    }
    else if(h == 'F'){
       return 15;
    }
    return NULL;
}