十进制转十六

#include <iostream>#include <cstdio>#define M 1000using namespace std;int k = 0;char a[20] = {'0','1','2','3','4','5','6','7','8','9','A',             'B','C','D','E','F'};int change(int num, char *p){    int m;    while(num){        m = num%16;        num = num/16;        p[k++] = a[m];    }    return 1;}int main(){    int val;    char temp[M];    printf("please input a num:\n");    scanf("%d", &val);    change(val, temp);    for(int j = k-1; j >= 0; j--){        printf("%c",temp[j]);    }    printf("\n");    return 0;}