Pangram Checker

Pangram-is a word or Phrase which have all the Alphabets from a to z in it.

"Nice One Program"

#include<iostream.h>
#include<conio.h>
#include<string.h>
#include<ctype.h>

void main()
{  clrscr();
  char s[100]; int l,i=0,j,f=0;
  cout<<"Enter The String For Checking:\n\n";
  cin.getline(s,100);

  l=strlen(s);
  int t;
  cout<<l<<endl;

 while(s[i])
 {
  s[i]=tolower(s[i]);
   i++;
 }
      cout<<s;
   for(i=97;i<122;i++)
{  for(j=0;j<l;j++)
  { t=s[j];
    if(s[j]=='\0')
    f=0;
    else if(t==i)
    f=1;
  }

 if(f==0)
 break;

}

if(f==1)
cout<<"\n\nPANGRAM";
else
cout<<"\n\nNOT PANGRAM";
getch();

}