7.c

#include<stdio.h>
#include <math.h>
int main()
{
   int i;
   float a, x, y1, y2;
   a = 0.4;
   printf("             y -------->             \n");
   printf("-------------------------------------\n");
   for (x=0; x<5; x= x + 0.25)
   {
      y1 = (int) (50*exp(-a * x)+0.5);
      y2 = (int) (50*exp(-a * x + x/2)+0.5);
      if (y1 == y2)
      {
         if (x==2.5)
            printf(" X |");
         else
            printf("|");
         for (i=1; i <= y1-1; ++i)
            printf(" ");
         printf("#\n");
         continue;
      }
      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("-");
         continue;
      }
      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");
   }
   printf("  |n");
}