This section contains carefully selected MCQs and Previous Year Questions with explanations to help students understand concepts and prepare effectively for examinations, interviews, and competitive tests.
Q: 1A sequence of alphabet, digits and symbols enclosed within double quotation mark is called a ___________.
Option B
In C, a String is a sequence of characters, which can include letters, digits, and symbols, enclosed within double quotation marks " ". For example, "Suraku Academy!" is a string.
Q: 2The string is always terminated with __________ character.
Option B
In C, strings are sequences of characters stored in memory. To indicate the end of a string, C automatically adds a special character called the null character, written as . This tells the program where the string ends.
Q: 3Consider the following C declaration
#include<stdio.h>
#include<string.h>
int main()
{
char data[10];
char *myString=”HAT”;
int length=strlen(myString);
printf(“%d”,length);
return 0;
}
The output of the program is
Option C
In this program, the pointer myString is initialized with the string "HAT". The function strlen(myString) calculates the number of characters in the string, excluding the null character (' ').
The string "HAT" contains three characters. Although internally it is stored as HAT , the null character is not counted by strlen().
Therefore, length becomes 3.
Q: 4Which of the following function sets first n characters of a string to a given character?
Option C
The function strnset() is used to set the first n characters of a string to a specified character. If n is greater than the length of string, the length of string is used in place of n.
Syntax:
char *strnset(const char *str, char ch, int n);
E.g.:
#include <stdio.h>
#include <string.h>
void main()
{
char str[]="SURAKU";
strnset(str,'*',3);
printf("%s",str);
}
OUTPUT
***AKU
Q: 5What is the output of the following C code snippet?
#include<stdio.h>
void main()
{
char str1[]=”ISRO”, str2[]=”ISRO”;
if(str1==str2)
{
printf(“Both are Same”);
}
else
{
printf(“Both are Not Same”);
}
}
Option B
In this program, two character arrays str1 and str2 are declared and both are initialized with the same string "ISRO". Although the content of both arrays is identical, they are stored in different memory locations because they are separate arrays.
When the condition str1 == str2 is used, it does not compare the actual characters of the strings. Instead, it compares the memory addresses of the two arrays. Since both arrays have different addresses, the condition becomes false.
Therefore, the else block executes and the output printed is "Both are Not Same".
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