#include    <math.h>                                        
   main()                                                      
   {                                                           
       int  i;                                                 
       float  a, x, y1, y2;                                    
                                                               
       a = 0.4;                                                
       printf("                           Y -------> \n");     
       printf("  0 -----------------------------------------\n");                     
       for ( x = 0; x < 5;  x = x+0.25)                        
       {   /*  BEGINNING OF FOR LOOP  */
/*......Evaluation of functions .......*/
               
           y1 = (int) ( 50 * exp( -a * x ) + 0.5 );            
           y2 = (int) ( 50 * exp( -a * x * x/2 ) + 0.5 );      
 
       /*......Plotting when y1 = y2.........*/
if ( y1 == y2)                                      
           {                                                   
              if ( x == 2.5)                                   
                 printf("  X |");                              
              else                                             
                 printf("    |");                              
                                                               
              for ( i = 1; i <= y1 - 1; ++i)                   
                 printf(" ");                                  
                                                               
              printf("#\n");                                   
              continue;                                        
           }                                                   
                                                               
       /*...... Plotting when y1 > y2 .....*/
if ( y1 > y2)                                       
           {                                                   
              if ( x == 2.5 )                                  
                 printf("  X |");                              
              else                                             
                 printf("    |");                              
                                                               
              for ( i = 1; i <= y2 -1 ; ++i)                   
                 printf(" ");                                  
                                                               
              printf("*");                                     
                                                               
              for ( i = 1; i <= (y1 - y2 - 1); ++i)            
                 printf("-");                                  
                                                               
              printf("0\n");                                   
              continue;                                        
           }                                                   
                                                               
       /*........  Plotting when y2 > y1.........*/
if ( x == 2.5)                                      
              printf("  X |");                                 
           else                                                
              printf("    |");                                 
                                                               
           for ( i = 1 ; i <= (y1 - 1); ++i )                  
              printf(" ");                                     
                                                               
printf("0");                                                                                                                 for ( i = 1; i <= ( y2 - y1 - 1 ); ++i)             
              printf("-");                                     
                                                                          printf("*\n");                                      
                                                              
       }   /*.......END OF FOR LOOP........*/
                  
           printf("    |\n");                                  
   }                                                           
                                                               



Output                                                      
                              Y ------->                        
     0 ----------------------------------------------------    
       |                                                 #     
       |                                            0---*      
       |                                        0------*       
       |                                    0-------*          
       |                                 0------*              
       |                             0------*                  
       |                          0----*                       
       |                        0-*                            
       |                     #                                 
       |                 *-0                                   
     X |             *---0                                     
       |          *-----0                                      
       |       *------0                                        
       |     *-------0                                         
       |   *-------0                                           
       |  *-------0                                            
       | *-------0                                             
       |*-------0                                              
       |*------0                                               
       |*-----0