your problem is here 
 for(c=1;c<=o; s++)
c and o are global variable which are equal to 1. i am not quite sure what you 
want to do.
1. s is not initialized 
2. c= 1 and o =1 then c = o always equal to each other.
2. there is no limit to exit the loop that's why s++ keeps incrementing
3. or maybe be missing one brace sign, maybe it should look like this:
 for(c=1;c<=o; s++)
{ // missing brace
 printf("c");
 printf("\n") ;
 o=o+2;
 }


----- Original Message ----
From: Robert Ryan <[EMAIL PROTECTED]>
To: [email protected]
Sent: Saturday, February 16, 2008 8:54:25 PM
Subject: RE: [c-prog] infinite loop

                  I set r to 0, but it gives the same results

Mariano Hevia <mariano.hevia@ fibertel. com.ar> wrote:                          
     Check the inicial value of the variable r: it is never initialized. Surely,
 its inicial value is unexpected for your porpouse. I may guess you expected
 that 0 is assigned. But there is no gaurantee for a variable defined inside
 { }.
 
 -----Mensaje original---- -
 De: [EMAIL PROTECTED] com [mailto:[EMAIL PROTECTED] com] En nombre de
 Robert Ryan
 Enviado el: Sábado, 16 de Febrero de 2008 02:45 p.m.
 Para: [EMAIL PROTECTED] com
 Asunto: [c-prog] infinite loop
 
 this gives an infinite loop..... Why?
 
 //#include<conio. h>
 #include<stdio. h>
 int main()
 {
 int tr=10,r,c,s, o=1;
 //clrscr();
 for(c=1; c<=tr; r++)
 {
 for(c=1;c<=tr- r;c++)
 {
 printf(" ");
 }
 for(c=1;c<=o; s++)
 printf("c");
 printf("\n") ;
 o=o+2;
 }
 //getch();
 }
 
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