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#include <stdio.h>
char *encode(char *s,int offset)
{
char *p=s;
while (*p)
{
*p +=offset;
}
return s;
}
char *decode(char *sm ,int iffset)
{
char *p= sm;
while(*p)
{
*p-=iffset;
}
return sm;
}
int main(){
	char *ss="hello";
	char * a=encode(ss);
	printf("%s\n",a);
	char *b=decode(a);
	printf("%d\n",b);
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:21:11: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings]
  char *ss="hello";
           ^~~~~~~
prog.cpp:22:20: error: too few arguments to function ‘char* encode(char*, int)’
  char * a=encode(ss);
                    ^
prog.cpp:2:7: note: declared here
 char *encode(char *s,int offset)
       ^~~~~~
prog.cpp:24:18: error: too few arguments to function ‘char* decode(char*, int)’
  char *b=decode(a);
                  ^
prog.cpp:11:7: note: declared here
 char *decode(char *sm ,int iffset)
       ^~~~~~

Standard output is empty