SEQUENTIAL FILE ALLOCATION

#include <stdio.h>
int main(){
int a1[50],n,i,j,k,nb,st;
for(i=0;i<50;i++)
a1[i]=0;
do{
k=0;
printf("Enter number of blocks and number of starting block\n");
scanf("%d%d",&nb,&st);
for(i=st;i<(st+nb);i++){
if(a1[i]==0)
k+=1;
}
if(k==nb){
for(i=st;i<(st+nb);i++){
     a1[i]=1;
     j+=1;
}
printf("File allocated successfully\n");
}
else{
printf("File cannot be allocated\n");
}
printf("Do you want to continue to insert another file\n1.YES\t2.NO\n");
scanf("%d",&i);
}while(i==1);
return 0;
}