C Language (Conversion Celcius b/w farheniet)

#include
#include

void main()
{
 clrscr();
 int a,e,s,o;
 printf("For Even Nos type 1 and for ODD Nos type 2");
 scanf("%d",&o);
 printf("\n Enter starting value");
 scanf("%d",&s);
 printf("\n Enter End Value");
 scanf("%d",&e);
 if (o==1)
 {  if (s%2!=0)
 {  s++;  } }
 if (o==2)
 { if (s%2==0)
 { s++; }}
 for (a=s;a<=e;a++,a++)

 printf("\n The loop is %d", a);

 getch();

}