C String Test Quiz

1) Which function is more appropriate for reading a multi-word string?

• ✅ gets
• ✅ printf
• ✅ scanf

Explanation:

The gets function is employed to gather a sequence of characters that ends with a newline character from the standard input stream stdin.

Thus, gets is better suited for retrieving a string containing multiple words.

2) Which library function can change an unsigned long integer to a string?

• ✅ system
• ✅ ltoa
• ✅ ultoa
• ✅ unsigned long can't be change into a string

Explanation:

The ultoa function is employed to convert an unsigned long integer into a string.

3) What is the value return by strcmp function when two strings are the same?

• ✅ Error

Explanation:

The C library function strcmp is utilized to compare two strings and returns a value based on their relationship.

int strcmp (const char *str1, const char *str2)

A comparison is made between the first string (str1) and a second string (str2).

On comparing the two string, the values return by a function strcmp are:

• ✅ If, str1 is equal to str2 then Return value = 0
• ✅ If, str1 is greater than str2 then Return value > 0
• ✅ If, str1 is less than str2 then Return value < 0

4) What is built in library function for comparing the two strings?

• ✅ strcmp
• ✅ equals
• ✅ str_compare
• ✅ string_cmp

Explanation:

The strcmp function is a predefined function found in the "string.h" header file. Its purpose is to compare two strings, with a return value of 0 indicating identical strings. In cases where the first string is considered greater than the second, a positive value above 0 is returned; conversely, a negative value is returned if the second string is greater.

5) What will be the output of the below program?

#include<stdio.h>

int main()

{

    char a[] = "%d\n";

    a[1] = 'b';

    printf(a, 65);

    return 0;

}

Explanation:

Step 1: Define a character array 'a' with the string "%d\n" assigned to it for initialization purposes.

By executing Step 2, the element at index 1 in array ?a? is updated to 'b'. Consequently, the array ?a? transforms to "%c".

Step 3: printf(a, 65); becomes printf("%c", 65);

Consequently, it will display the ASCII value corresponding to 65, resulting in the output being 'A'.