Java C String Test, Core Java Quiz, java C string MCQ

char *strrchr(const char *s, int c);

It scans a string s in the reverse direction, looking for a specific character c.

Example:

#include <string.h>
#include <stdio.h>

int main(void)
{
char text[] = “I learn through IndiaBIX.com”;
char *ptr, c = ´i´;

ptr = strrchr(text, c);
if (ptr)
printf(“The position of ´%c´ is: %d “, c, ptr-text);
else
printf(“The character was not found “);
return 0;
}
Output:

The position of ´i´ is: 19

Because we can assign a new string to a pointer but not to an array a.

Yes, both the statements prints the same character a.

gets(); collects a string of characters terminated by a new line from the standard input stream stdin

strcmp(const char *s1, const char*s2);
The strcmp return an int value that is
if s1 < s2 returns a value < 0
if s1 == s2 returns 0
if s1 > s2 returns a value > 0

In first statement the character pointer ch stores the address of the string “JavaTpoint”.
The second statement specifies the space for 7 characters be allocated and that the name of location is ch.

char *strnset(char *s, int ch, size_t n); Sets the first n characters of s to ch

#include <stdio.h>
#include <string.h>

int main(void)
{
char *string = “abcdefghijklmnopqrstuvwxyz”;
char letter = ´x´;

printf(“string before strnset: %s “, string);
strnset(string, letter, 13);
printf(“string after strnset: %s “, string);

return 0;
}
Output:

string before strnset: abcdefghijklmnopqrstuvwxyz

string after strnset: xxxxxxxxxxxxxnopqrstuvwxyz

The statement printf(“\n”); prints ´ ´ on the screen.

This program converts the given string to upper case string.

Step 1: char p[] = “%d “; The variable p is declared as an array of characters and initialized with string “%d”.
Step 2: p[1] = ´c´; Here, we overwrite the second element of array p by ´c´. So array p becomes “%c”.
Step 3: printf(p, 65); becomes printf(“%c”, 65);
Therefore it prints the ASCII value of 65. The output is ´A´.

The function strlen returns the number of characters in the given string.
Therefore, strlen(“123456”) returns 6.
Hence the output of the program is “6”.

Step 1: void fun(); This is the prototype for the function fun().
Step 2: fun(); The function fun() is called here.
The function fun() gets a character input and the input is terminated by an enter key(New line character). It prints the given character in the reverse order.
The given input characters are “abc”
Output: cba

A string is a collection of characters terminated by ´´.

printf(5+”Good Morning “); It skips the 5 characters and prints the given string.
Hence the output is “Morning”

Step 1: char str1[20] = “Hello”, str2[20] = ” World”; The variable str1 and str2 is declared as an array of characters and initialized with value “Hello” and ” World” respectively.
Step 2: printf(“%s “, strcpy(str2, strcat(str1, str2)));
=> strcat(str1, str2)) it append the string str2 to str1. The result will be stored in str1. Therefore str1 contains “Hello World”.
=> strcpy(str2, “Hello World”) it copies the “Hello World” to the variable str2.
Hence it prints “Hello World”.

printf(“Java”, “Tpoint “); It prints “Java”. Because ,(comma) operator has Left to Right associativity. After printing “Java”, the statement got terminated.