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Strings

Q1: Which of the following function is correct that finds the length of a string?

A 
int xstrlen(char *s)
{
    int length=0;
    while(*s!='\0')
    {    length++; s++; }
    return (length);
}

B 
int xstrlen(char s)
{
    int length=0;
    while(*s!='\0')
        length++; s++;
    return (length);
}

C 
int xstrlen(char *s)
{
    int length=0;
    while(*s!='\0')
        length++;
    return (length);
}

D 
int xstrlen(char *s)
{
    int length=0;
    while(*s!='\0')
        s++;
    return (length);
}

ANS:A - 

int xstrlen(char *s)
{
    int length=0;
    while(*s!='\0')
    {    length++; s++; }
    return (length);
}

Option A is the correct function to find the length of given string. Example: 

#include<stdio.h>

int xstrlen(char *s)
{
    int length=0;
    while(*s!='\0')
    { length++; s++; }
    return (length);
}

int main()
{
    char d[] = "AptitudeCrack";
    printf("Length = %d\n", xstrlen(d));
    return 0;
}
Output: Length = 8



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