beautiful stars pattern based on inputted number-asr

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#include <stdio.h>
#include <stdlib.h>

int main()
{
    char a[20],n[10];
int num[10],x=0;
int i=0,big=1,j;
while(1){
a[i]=getchar();
n[0]=a[i]; //assignt into n[0] otherwise will err...coz index start from 0
num[x]=atoi(n);

   if(a[i]=='\n'){
    break;
   } 
i++;
x++;

}

big=num[0];
for(i=1;i<x;i++){
      if(big<num[i])
  {
        big=num[i];      //finding big number from input
      }
 
 }


for(i=0;i<=big;i++){
 
   for(j=0;j<x;j++){
     
      if(i==big)
      {
          printf("%d ",num[j]);  // print numbers in bottom
      }
      else
  {
               if(i>=big-num[j]) printf("* ");    //printing stars logic
              else printf("  ");   //else print only space
   
      }
   
   
   }
  printf("\n");
}


}