• C

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

Hi all,
   Its my first quesion, which was asked for me in interview.
write function which talks pointer to char and returns pointer to char of ASCII values of corresponding char. For example, if i pass string "abcde" to function , it should return pointer to string "6162636465", (that is a=65,b=62,.....). Plz help me,
maheshptlAsked:
Who is Participating?
 
stefan73Connect With a Mentor Commented:
Hi ozo,
> sprintf(&str[2*i],"%02x",s[i]);  
Should be decimal - then you'd also have the issue of 2 or 3 chars:

char * func(char *s){
    char *str=malloc(3*strlen(s)+1);
    int i;
    str[0]='\0';
    for( i=0;s[i]; i+=1 ){
        sprintf(&str[strlen(str)],"%d",s[i]);  
    }
    return str;
}


Cheers,

Stefan
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ankuratvbCommented:
>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).
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ankuratvbCommented:
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??
0
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ankuratvbCommented:
BTW,

"ABCDE" should return "6566676869"

"abcde" would return "979899100101"

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ankuratvbCommented:
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;
}
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ozoCommented:
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;
}
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Kent OlsenData Warehouse Architect / DBACommented:

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;
}
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