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#include <stdio.h>
#include <conio.h>
int a,i;
int main()
{
 
   printf("\nNhap a:");
   scanf("%d", a);
   for (i=0;i<=20;i++)
   {
       a%=10;
       a++;
       printf("\na= %d",a);
   }
 
   return 0;
 
}
 
 

Main.java:1: error: illegal character: '#'
#include <stdio.h>
^
Main.java:1: error: class, interface, or enum expected
#include <stdio.h>
         ^
Main.java:2: error: illegal character: '#'
#include <conio.h>
^
Main.java:4: error: class, interface, or enum expected
int main()
^
Main.java:8: error: class, interface, or enum expected
   scanf("%d", a);
   ^
Main.java:9: error: class, interface, or enum expected
   for (i=0;i<=20;i++)
   ^
Main.java:9: error: class, interface, or enum expected
   for (i=0;i<=20;i++)
            ^
Main.java:9: error: class, interface, or enum expected
   for (i=0;i<=20;i++)
                  ^
Main.java:12: error: class, interface, or enum expected
       a++;
       ^
Main.java:13: error: class, interface, or enum expected
       printf("\na= %d",a);
       ^
Main.java:14: error: class, interface, or enum expected
   }
   ^
Main.java:18: error: class, interface, or enum expected
}
^
12 errors

Standard output is empty