进制转换

#include 
#define M (sizeof(unsigned int) * 8)/** 用于声明char数组的长度 **/

int trans(unsigned int m,int d,char s[]);
/**
 * @brief main  将一个无符号整数转换成任意d进制数(2 << d << 16)
 * @return
 */
int main(void)
{
    unsigned int m;
    printf("Please enter the digits you want to transform:\n");
    scanf("%d",&m);
    char str[33];
    int i = 0;
    printf("The translate results are:\n");
    for(i = 2;i <= 16;i++){
        int nums = trans(m,i,str);
        printf("%d  =   ",m);
        int j = 0;
        for(j = 0;j < nums;j++){
            printf("%c",str[j]);
        }
        printf("(%d)\n",i);
    }
    return 0;
}

int trans(unsigned int m,int d,char str[]){

    if(d < 2 || d > 16){
        //将s置为0
        str[0] = '\0';
        return 0;
    }
    /** 用于保存进制数 **/
    char digits[] = "0123456789ABCDEF";
    int i = M;
    int j = 0;
    char buf[M+1];
    /** 用于保存商 **/
    int s = m;
    buf[i] = '\0';
    //这里使用do...while
    do{
        buf[--i] = digits[s % d];
        s = s / d;
    }while(s);
    //对数组s进行赋值
    for(j = 0;(str[j]=buf[i])!= '\0';j++,i++);
    return j;
}