Thursday, 9 November 2017

Strings Questions In C


Strings are actually one-dimensional array of characters terminated by a null character '\0'. Thus a null-terminated string contains the characters that comprise the string followed by a null.

Eg.

#include

int main () {

   char greeting[6] = {'H', 'e', 'l', 'l', 'o', '\0'};
   printf("Greeting message: %s\n", greeting );
   return 0;
}
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1.
If the two strings are identical, then strcmp() function returns
A.   -1
B. 1
C. 0
D.    Yes

Answer: C
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2.
The library function used to find the last occurrence of a character in a string is

A.    strnstr()
B. laststr()
C. strrchr()
D. strstr()

Answer: C
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3.
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')
        s++;
        return (length);
        }

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

Answer: A
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4.
Which of the following function is more appropriate for reading in a multi-word string?

A.    printf();
B.     scanf();
C. gets();
D. puts();

Answer: C
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5.
What will be the output ?

#include
#include

int main()
{
    char str1[20] = "Hello", str2[20] = " World";
    printf("%s\n", strcpy(str2, strcat(str1, str2)));
    return 0;
}

A. Hello
B. World
C. Hello World
D. WorldHello

Answer: C
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More Imp Topics:

Array
Preprocessor
Structures
Control Structures
Switch Case
Printf
Variables
File Handling

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