Program in C to show multiprogramming variable task

#include<stdio.h>

#include<conio.h>

main()

{             

            int i,m,n,tot,s[20];

            clrscr();

            printf("Enter total memory size:");

            scanf("%d",&tot);

            printf("Enter no. of pages:");

            scanf("%d",&n);

            printf("Enter memory for OS:");

            scanf("%d",&m);

            for(i=0;i<n;i++)

            {

                        printf("Enter size of page%d:",i+1);

                        scanf("%d",&s[i]);

            }

            tot=tot-m;

            for(i=0;i<n;i++)

            {

                        if(tot>=s[i])

                        {

                                    printf("Allocate page %d\n",i+1);

                                    tot=tot-s[i];

                        }

                        else

                                    printf("process p%d is blocked\n",i+1);

            }

            printf("External Fragmentation is=%d",tot);

            getch();

}

Output