/in/main.c: In function 'main':
/in/main.c:6:13: warning: multi-character character constant [-Wmultichar]
     fprintf('%d',c);
             ^~~~
/in/main.c:6:13: warning: passing argument 1 of 'fprintf' makes pointer from integer without a cast [-Wint-conversion]
In file included from /in/main.c:1:0:
/usr/include/stdio.h:358:12: note: expected 'FILE * restrict {aka struct _IO_FILE * restrict}' but argument is of type 'int'
 extern int fprintf (FILE *__restrict __stream,
            ^~~~~~~
/in/main.c:6:18: warning: passing argument 2 of 'fprintf' makes pointer from integer without a cast [-Wint-conversion]
     fprintf('%d',c);
                  ^
In file included from /in/main.c:1:0:
/usr/include/stdio.h:358:12: note: expected 'const char * restrict' but argument is of type 'int'
 extern int fprintf (FILE *__restrict __stream,
            ^~~~~~~
/in/main.c:5:6: warning: 'a' is used uninitialized in this function [-Wuninitialized]
     c=a+b;
     ~^~~~
/in/main.c:5:6: warning: 'b' is used uninitialized in this function [-Wuninitialized]