C Programming - Library Functions - Discussion

Discussion Forum : Library Functions - General Questions (Q.No. 3)

Library Functions

Which standard library function will you use to find the last occurance of a character in a string in C?

strnchar()

strchar()

strrchar()

strrchr()

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 1 of 2.

Mayur22kar said: 4 years ago

Thanks @Srikanth.

Suchi said: 7 years ago

I am not getting can anyone explain option D.

(1)

Sridhar said: 7 years ago

Why the array range from 50 to 66 @Srikanth.

(1)

Suraj said: 8 years ago

Nice explanation @Srikanth.

Prateek said: 8 years ago

Thanks @Srikanth.

Mostafa Yasin said: 8 years ago

Thanks @Ashish.

ISHWARYA said: 8 years ago

Thank you so much @Srikanth.

Rajes said: 9 years ago

Thanks @Srikanth.

Ashish said: 1 decade ago

In the example it is given that,

char str[30] = "12345678910111213";

Base address of str is 0.
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"
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16.

So,
strrchr(str,'2') returns 14. (the address of the last occurrence).

And we know str=0(base address).

(strrchr(str,'2') - str )=(14-0)=14.

Neha said: 1 decade ago

Thanks shrikant it is really very easy when you explained it.

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