/*
 * SelfTest1
 * Chapter 7
 * John Stile
 */
1. Correct the follwing code fragment:
PROBLEM:                 FIX:
int main(void)           int main(void)
int xx;                  int xx;
while (x<21);            while(x<21)
                         {
  printf("%d\n",xx);       printf("%d\n", xx);
  xx=(xx+1);               xx=(xx+1);
                         }
  return 0;              return 0;
}                        }

2. Correct the following code fragment:
PROBLEM:                 FIX:
for (yy=0) (yy<=20);     for (yy=0; yy<=20; yy=yy+yy)
                         }
  yy=yy+yy                 
  printf("%d\n",yy)        printf("%d\n",yy);
                         }       

3. The gloa is to modify a previous program to produce the following output.
                        Aa
... --to-- ...
AaBbCcDdEeFfGgHhIiJjKkLlMm

Anser: See SelfTest1.3.c