c - Removing Duplicate values and adding 0 on their place -

i have written code remove duplicate values , add 0 on there place . feel code should better this,if can give better idea of developing code. please suggest me , advice me.

• input--2,3,4,3,6
• output--2,3,4,0,6

here code:

#include<stdio.h> int main() {    int a[100],b[100];    int i,j,size;    scanf("%d",&size);    for(i=0;i<size;i++)    {       scanf("%d",&a[i]);    }     for(i=0;i<size;i++)    {       b[i]=a[i];     }     for(i=0;i<size;i++)    {       for(j=i+1;j<size;j++)       {          if(a[i]==a[j])          {             b[j]=0;          }       }    }     for(i=0;i<size;i++)       printf("%d\n",b[i]);     return 0; } 

clear duplicates entered follows, comparing values entered far:

#include<stdio.h> int main() {   int a[100];   int i,j,size;   scanf("%d",&size);   for(i=0;i<size;i++)     {       scanf("%d",&a[i]);       for(j=0;j<i;j++){         if(a[j]==a[i]) {           a[i]=0; /* found duplicate among previous entries! */           break;         }       }     }   for(i=0;i<size;i++)     printf("%d\n",a[i]);   return 0; }