数制转换 源程序

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#include <stdio.h>
#define base 2/*这里你可以转换任何进制的数,这里是2进制*/

int main()
{
        int n;
        char str[33];
        int i=0;
        int j=0;
        int k;
        char tmp;
        scanf("%d",&n);
        
        while(n)
        {
            str[i]=n%base;
            if (str[i]>9)
                    str[i]='A'+str[i]-10;
            else str[i]='0'+str[i];
               
            i++;
            n=n/base;
        }
        str[i]=0;
           
           //reverse the string

           k=i-1;
            while (j<k)
            {
                tmp=str[k];
                str[k]=str[j];
                str[j]=tmp;
                j++;
                k--;
            }
           
            printf("string is %s\n",str);
   
    return 0;
}

 

//１０进制与８进制转换。



#include <stdio.h>

int main()
{
    int decNum;
    int i=0;
    char result[12];
    int middle=0x0007;
    int orgNum;
    scanf("%d",&decNum);
    
    orgNum=decNum;
    for (i=0; i<11; i++)
    {
        result[10-i]=(orgNum & middle) +'0';
         orgNum>>=3;
        
    }
    result[11]='\0';
    
    printf("result is %s\n",result);
    
    return 0;
}



//dec to 8,10, 16


#include <stdio.h>

int main()
{
    int dec;
    char str[33];
    scanf("%d", &dec);
    
    sprintf(str,"%x",dec); //dec to 16

    printf("dec to 16 ,str is :%s\n",str);
    
    sprintf(str,"%o",dec); //dec to 8

    printf("dec to 8,str is :%s\n",str);
    
    sprintf(str,"%u",dec); //dec to 10

    printf("dec to 10,str is :%s\n",str);
    
        
    return 0;

}