String challenge using strtok() function

#1

here how has sir used while(key>1) and inside it doing key–, suppose in 10 20 30 40 i have enter the key 4 , then how it is returning 40 ?, because of return statement is outside the loop so it should return 20 naa instead of 40?? please clear my doubt…

#2

Are you talking about this segment of code??

string extract_string_at_key(string str,int key)
{
    char *s;
    s=strtok((char*)str.c_str()," ");
    while(key>1)
    {
        s=strtok(NULL," ");
        key--;
    }
    return (string)s;
}

i am considering your input
10 20 30 40 and key is 4

so intially s contains 10
after that we enter into loop and s become 20 and key=3
then s = 30 key=2
then s= 40 key =1
now we can’t go inside loop and come out of the loop
and return 40 as string

i hope it is clear now
if yes show your response with :heart: and don’t forgot to mark doubt as resolved
if you want to ask something about this feel free to ask

#3

you have cleared my previous doubt, thanks u for that :heart: … But i have one more doubt that in strtok() function why we are using char *s , can we use only char s? if not then what is the difference between char s are char * s??

#4

char s is a character named s
while
char * s is pointer to char named s
char * s can also used for character array
similar to int *arr;

hence we can’t use char s in strtok because ti require character array not character

#5

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