C，Sprintf解法，使用字符串直观处理

#include<stdio.h>
#include<string.h>
int main(){
   int iput=0,oput=0,len=0,i=0,j=0;
    char iLiteral[32]="";
    char oLiteral[32]="";
    scanf("%i",&iput);
    sprintf(iLiteral,"%i",iput);
    //把数字字符串反过来，同时去除相同值
    len=strlen(iLiteral);
    for(i=0,j=len-1;j>=0;j--){
        if(NULL == strchr(oLiteral,iLiteral[j])){
                oLiteral[i]=iLiteral[j];
                i++;
            }
    }
    oLiteral[i]='\0';

    sscanf(oLiteral,"%i",&oput);
    printf("%i",oput);

}