Reverse A String In C Exercise 4

✅ while (start < end)
✅ while (str != NULL)
✅ while (str != '\0')

Explanation:

The right way to terminate the loop is when the starting index is not less than the ending index, ensuring all the characters swapping are completed.

What is the main purpose of using a temporary variable when swapping characters in the string reversal function?

✅ To store the string length.
✅ To store the original value of a character during the swap.
✅ To check for null pointers.
✅ To print the string.

Explanation:

The temporary placeholder utilized in this scenario is crucial for temporarily holding character values while executing the swapping operation, preventing any loss of data.

What might the resulting output of the subsequent code snippet be?

Example


#include<stdio.h>
void revrseString(char *str)
{
    char *end = str;
    while (*end != '\0') {
        end++;
    }
    end--;
    while (str < end) {
        char temp = *str;
        *str++ = *end;
        *end-- = temp;
    }
}
int main() {
    char str[] = "openai";
    reverseString(str);
    printf("%s\n", str);
    return 0;
}

✅ ianepo
✅ openai
✅ iaenpo
✅ error

Explanation:

The reverseString function effectively inverts the string "openai" to "ianepo".

What might the result be of the subsequent code snippet?

Example


#include<stdio.h>
#include<string.h>
void reverseString(cahr *str)
{
int n=strlen(str);
for(int i=-;i<n/2;i++)
{
        char temp = str[i];
        str[i] = str[n - i - 1];
        str[n - i - 1] = temp;
    }
}
int main() {
    char str[] = "";
    reverseString(str);
    printf("%s\n", str);
    return 0;
}

✅ The function will crash.
✅ The function will print nothing.
✅ The function will print a space.
✅ The function will print "error".

Explanation:

If the input is an empty string, the function strlen(str) will return 0, causing the loop to not be executed. Consequently, the program will output an empty string.

What is the expected output of the code snippet below?

Example


#include<stdio.h>
#include<string.h>
void reverseString(char *str,int n)
{
for(i=0;i<n/2;i++)
{
        char temp = str[i];
        str[i] = str[n - i - 1];
        str[n - i - 1] = temp;
    }
}
int main() {
    char str[] = "CProgramming";
    int len = strlen(str);
    reverseString(str, len);
    printf("%s\n", str);
    return 0;
}

✅ gnimmargorPC
✅ gnimmargorP
✅ CProgramming
✅ gnimmarPC

Explanation:

Here, the reverseString function effectively reverses the given string "CProgramming" to "gnimmargorPC".

Which of the provided code snippets can accurately reverse the string " Hello" stored in the character array str?

Example


int len = strlen(str);
for(i=0;i<len/2;i++)
{
    char temp = str[i];
str[i]=str[len-i-1];
str[len-i-1]=temp;
}

Example


int len = strlen(str);
for(i=0;i<len;i++)
{
    char temp = str[i];
str[i]=str[len-i-1];
str[len-i-1]=temp;
}

Example


int len = strlen(str);
for(i=0;i<len/2;i++)
{
str[i]=str[len-i-1];
}

Example


int len = strlen(str);
for(i=0;i>=0;i--)
{
printf(?%c?,str[i]);
}

Explanation:

The initial and terminal characters exchange positions prior to moving towards the middle. Subsequent to swapping with the ultimate characters, the initial characters progress towards the center and rotate consistently. What result can be expected from the code snippet provided below?

Example


#include<stdio.h>
#include<string.h>
void reverse(char *str)
{
    int len = strlen(str);
    char *end = str + len - 1;
    while (str < end) {
        char temp = *str;
        *str++ = *end;
        *end-- = temp;
    }
}
int main() {
    char str[] = "abcde";
    reverse(str);
    printf("%s", str);
    return 0;
}

✅ abcde
✅ edcba
✅ abced
✅ eabcd

Explanation:

The reverse operation described will invert the order of characters in a string, transforming 'abcde' into 'edcba' by manipulating pointers.

What will be displayed by running this code?

Example


#include<stdio.h>
#include<string.h>
void reverseString(char *str)
{
int start=0,end=strlen(str-1);
while(start<end)
{
        char temp = str[start];
        str[start] = str[end];
        str[end] = temp;
        start++;
        end--;
    }
}
int main() {
    char str[] = "12345";
    reverseString(str);
    printf("%s\n", str);
return 0;
}

✅ 54321
✅ 12345
✅ 52341
✅ error

Explanation:

The given operation converts the string '12345' to '54321' by shifting it to the center. This transformation is achieved using the reverseString method, which reverses the string from its initial position to the final position.

Input Required