/in/ex1.c: In function 'main':
/in/ex1.c:20:19: error: conversion to 'char' from 'int' may alter its value [-Werror=conversion]
     while ((ch1 = getchar()) && ch1!= '\n') {
                   ^~~~~~~
/in/ex1.c:24:23: error: conversion to 'char' from 'int' may alter its value [-Werror=conversion]
         while ((ch2 = getchar()) && ch2 != ' ' && ch2 != '\n' && ch2 != '.') {}
                       ^~~~~~~
/in/ex1.c:25:23: error: conversion to 'char' from 'int' may alter its value [-Werror=conversion]
         while ((ch2 = getchar()) && ch2 != ' ' && ch2 != '\n') {
                       ^~~~~~~
/in/ex1.c:36:24: error: passing argument 1 of 'strcmp' makes pointer from integer without a cast [-Werror=int-conversion]
             if (strcmp(*ptr,*cpp)) {
                        ^
In file included from /in/ex1.c:6:0:
/usr/include/string.h:136:12: note: expected 'const char *' but argument is of type 'char'
 extern int strcmp (const char *__s1, const char *__s2)
            ^~~~~~
/in/ex1.c:36:29: error: passing argument 2 of 'strcmp' makes pointer from integer without a cast [-Werror=int-conversion]
             if (strcmp(*ptr,*cpp)) {
                             ^
In file included from /in/ex1.c:6:0:
/usr/include/string.h:136:12: note: expected 'const char *' but argument is of type 'char'
 extern int strcmp (const char *__s1, const char *__s2)
            ^~~~~~
/in/ex1.c:39:24: error: passing argument 1 of 'strcmp' makes pointer from integer without a cast [-Werror=int-conversion]
             if (strcmp(*ptr,*doc)) {
                        ^
In file included from /in/ex1.c:6:0:
/usr/include/string.h:136:12: note: expected 'const char *' but argument is of type 'char'
 extern int strcmp (const char *__s1, const char *__s2)
            ^~~~~~
/in/ex1.c:39:29: error: passing argument 2 of 'strcmp' makes pointer from integer without a cast [-Werror=int-conversion]
             if (strcmp(*ptr,*doc)) {
                             ^
In file included from /in/ex1.c:6:0:
/usr/include/string.h:136:12: note: expected 'const char *' but argument is of type 'char'
 extern int strcmp (const char *__s1, const char *__s2)
            ^~~~~~
/in/ex1.c:41:25: error: passing argument 1 of 'strcmp' makes pointer from integer without a cast [-Werror=int-conversion]
             }if (strcmp(*ptr,*pptx)) {
                         ^
In file included from /in/ex1.c:6:0:
/usr/include/string.h:136:12: note: expected 'const char *' but argument is of type 'char'
 extern int strcmp (const char *__s1, const char *__s2)
            ^~~~~~
/in/ex1.c:41:30: error: passing argument 2 of 'strcmp' makes pointer from integer without a cast [-Werror=int-conversion]
             }if (strcmp(*ptr,*pptx)) {
                              ^
In file included from /in/ex1.c:6:0:
/usr/include/string.h:136:12: note: expected 'const char *' but argument is of type 'char'
 extern int strcmp (const char *__s1, const char *__s2)
            ^~~~~~
/in/ex1.c:14:9: error: unused variable 'length' [-Werror=unused-variable]
     int length = 0;
         ^~~~~~
/in/ex1.c:30:14: error: 'ptr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
         *ptr = arr[0];
         ~~~~~^~~~~~~~
cc1: all warnings being treated as errors