pass pointer to char and should return pointer char of corresponding ASCII values

>For example, if i pass string "abcde" to function , it should return pointer to string "6162636465", (that is >a=65,b=62,.....).

for "abcde",O/P should be "6566676869"

That's pretty simple.
cast each character into an integer,use itoa() to make it into a string and use strcat() to append it to ur final string.
Then return the address of this char array(string).

Do u actually want code for this,or u just looking for an explanation to the answer.

This is quite simple and i am actually surprised that this could be asked at an interview,
May i dare ask,which company??

BTW,

"ABCDE" should return "6566676869"

"abcde" would return "979899100101"

Here is the code:

#include<string.h>
char * func(char*);
int main()
{
 char *ptr="ABCDE";
 char *p;
 p=func(ptr);
 printf("%s",p);
}
char * func(char *s)
{
 char str[100];//declare to any large size
 char temp[5];//enough for string version for ASCII of 1 character
 int i;
 strcpy(str,"");
 while(*s!='\0')
 {
  i=*s;
  itoa(i,temp,10);
  strcat(str,temp);
  s++;
 }
 return str;
}

char * func(char *s){
    char *str=malloc(2*strlen(s)+1);
    int i;
    for( i=0;s[i]; i+=1 ){
        sprintf(&str[2*i],"%02x",s[i]);  
    }
    return str;
}

These "interview questions" always leave me scratching my head....  They don't provide a operational purpose and I'm not convinced of their "evalutation" value.

Taking the above mentioned examples another step:

char * func(char *s)
{
    char *ptr;
    char *str=malloc(3*strlen(s)+1);

    ptr = str;
    while (*s)
    {
      sprintf (ptr, %d,*(s++));
      ptr+=2;
    }
    *ptr = 0;
    return str;
}