FIFO Page Replacement algorithm in c

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code in C:

#include<stdio.h>
int main()
{
int i,j,n,a[50],frame[10],no,k,avail,count=0;
            printf("\nenter the length of the Reference string:\n");
   scanf("%d",&n);
            printf("\n enter the reference string:\n");
            for(i=1;i<=n;i++)
            scanf("%d",&a[i]);
            printf("\n enter the number of Frames:");
            scanf("%d",&no);
   for(i=0;i<no;i++)
             frame[i]= -1;
                        j=0;
                        printf("\tref string\t page frames\n");
      for(i=1;i<=n;i++)
                         {
                                    printf("%d\t\t",a[i]);
                                    avail=0;
                                    for(k=0;k<no;k++)
          if(frame[k]==a[i])
                                                avail=1;
                                    if (avail==0)
                                    {
                                                frame[j]=a[i];
                                                j=(j+1)%no;
                                                count++;
                                                for(k=0;k<no;k++)
                                                printf("%d\t",frame[k]);
         }
                                    printf("\n\n");
       }
                        printf("Page Fault Is %d",count);
                        return 0;
}

output:-

enter the length of the Reference string:
20

enter the reference string:
7
0
1
2
0
3
0
4
2
3
0
3
2
1
2
0
1
7
0
1

 enter the number of Frames:3
        ref string       page frames
7               7       -1      -1

0               7       0       -1

1               7       0       1

2               2       0       1

0

3               2       3       1

0               2       3       0

4               4       3       0

2               4       2       0

3               4       2       3

0               0       2       3

3

2

1               0       1       3

2               0       1       2

0

1

7               7       1       2

0               7       0       2

1               7       0       1

Page Fault Is 15
--------------------------------
Process exited after 38.24 seconds with return value 0
Press any key to continue . . .