C Programming - Library Functions - Discussion
Discussion Forum : Library Functions - General Questions (Q.No. 3)
3.
Which standard library function will you use to find the last occurance of a character in a string in C?
Answer: Option
Explanation:
strrchr() returns a pointer to the last occurrence of character in a string.
Example:
#include <stdio.h>
#include <string.h>
int main()
{
char str[30] = "12345678910111213";
printf("The last position of '2' is %d.\n",
strrchr(str, '2') - str);
return 0;
}
Output: The last position of '2' is 14.
Discussion:
18 comments Page 2 of 2.
RENU GURPREET said:
1 decade ago
Thanks @Srikanth.
Sonu said:
1 decade ago
Rightly said srikanth.
Kiran said:
1 decade ago
Excellent srikanth.
Ravi said:
1 decade ago
Thanks srikanth.
Srikanth said:
1 decade ago
In the example it is given that
char str[30]="12345678910111213";
Lets assume the base address of str is 50.
each char takes one byte.
so the array addresses will be from 50 to 66.i.e
"1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3"
50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66
so,
strrchr(str,'2') returns 64. (the address of the last occurence)
and we know str=50(base address)
( strrchr(str,'2') - str )=(64-50)=14.
char str[30]="12345678910111213";
Lets assume the base address of str is 50.
each char takes one byte.
so the array addresses will be from 50 to 66.i.e
"1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3"
50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66
so,
strrchr(str,'2') returns 64. (the address of the last occurence)
and we know str=50(base address)
( strrchr(str,'2') - str )=(64-50)=14.
(1)
Athinivas said:
1 decade ago
@Pruthvi strrchr() returns pointer to last(first in terms of position)occurence of char u given....so if we subtract the add of that returning pointer with the actual one...we get position...(Since char occupies a single byte)....Thanq u..
Pruthvi said:
1 decade ago
Why -str is used?
Suren said:
1 decade ago
Why we are putting -str there in printf statement? Please help me.
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