递归 将一个10进制数，转换为16进制

#include <stdio.h>

char HexToChar(unsigned int num)
{
    switch(num)
    {
        case 0 :
            return ‘0‘;
        case 1 :
            return ‘1‘;
        case 2 :
            return ‘2‘;
        case 3 :
            return ‘3‘;
        case 4 :
            return ‘4‘;
        case 5 :
            return ‘5‘;
        case 6 :
            return ‘6‘;
        case 7 :
            return ‘7‘;
        case 8 :
            return ‘8‘;
        case 9 :
            return ‘9‘;
        case 10 :
            return ‘a‘;
        case 11 :
            return ‘b‘;
        case 12 :
            return ‘c‘;
        case 13 :
            return ‘d‘;
        case 14 :
            return ‘e‘;
        case 15 :
            return ‘f‘;
            
    }
    return ‘0‘;
}

void MyHex(unsigned int num)
{
    unsigned int tmp = num%16;
    if(num > 16 )
        MyHex(num / 16);
    printf("%c",HexToChar(tmp));
}
    
int main()
{
   int a =100111;
    scanf("%d",&a);
    MyHex(a);
   printf("\n");
   
   return 0;
}