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#include <stdio.h>
main() {
   int arr[20], i, j, k, size;
 
   printf("\nEnter array size : ");
   scanf("%d", &size);
   k=size;
 
   printf("\nAccept Numbers : ");
   for (i = 0; i < size; i++)
      scanf("%d", &arr[i]);
 
   for (i = 0; i < size; i++) {
    for (j=i+1; j< size; J++){
      if (a[i] == a[j]){
        printf("%d ",a[i]);
        i++;
        continue;
      }
      else {
        printf("nothing");
      }
     }
   }
}

prog.c:2:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
 main() {
 ^~~~
prog.c: In function ‘main’:
prog.c:14:26: error: ‘J’ undeclared (first use in this function)
     for (j=i+1; j< size; J++){
                          ^
prog.c:14:26: note: each undeclared identifier is reported only once for each function it appears in
prog.c:15:11: error: ‘a’ undeclared (first use in this function)
       if (a[i] == a[j]){
           ^
prog.c:3:23: warning: variable ‘k’ set but not used [-Wunused-but-set-variable]
    int arr[20], i, j, k, size;
                       ^

Standard output is empty