void function1(void);
   void function2(void);                                                               
   main( )                                                     
   {
        int m = 1000;                                          
        function2();                                           
                                                               
        printf("%d\n",m);    /* Third output */
                                      
   }                                                           
   void function1(void)                                                 
   {                                                           
        int m = 10;                                            
                                                               
        printf("%d\n",m);    /* First output */
                                      
   }  

                                                         
   void function2(void)                                                 
   {                                                           
        int m = 100;                                           
        function1();                                           
        printf("%d\n",m);    /* Second output */
                                      
   }   
                                                        
 
Output                                                      
   10                                                          
   100                                                         
   1000