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Interview/Placement Preparation

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Explain the Bubble Sort algorithm and its time complexity.

Start at the beginning of the array. Compare the current element with the next element. If the current element is greater than the next element, swap them. Move to the next pair of elements and repeat steps 2-3. Continue this process for each element in the array. After one full pass, the largest element will be in its correct position. Repeat the process for the remaining unsorted elements until the entire array is sorted. Time Complexity of Bubble Sort: Best-case time complexity: O(n) Average-case time complexity: O(n^2) Worst-case time complexity: O(n^2)

Explain how to reverse a string in C.

#include <stdio.h> #include <string.h> void reverseString(char str[]) { int length = strlen(str); int i, j; char temp; for (i = 0, j = length - 1; i < j; i++, j--) { temp = str[i]; str[i] = str[j]; str[j] = temp; } } int main() { char inputString[100]; printf("Enter a string: "); scanf("%s", inputString); reverseString(inputString); printf("Reversed string: %sn", inputString); return 0; }

What is null pointer in C ?

A pointer that does not refer to ay address of value but NULL is known as a NULL pointer. When we assign '0' value to pointer of a any type. It becomes NULL.

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Java for Placement Preparation
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Java for Placement Preparation

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