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C++ Program to Perform Linear Search on a Vector

  C++ Program to Perform Linear Search on a Vector Introduction In this C++ program, we will learn how to perform a Linear Search on a vector. The program first takes the size of the vector and its elements as input. Then it asks the user for the element to search. If the element is found, it displays the index where it is located. Otherwise, it displays a message indicating that the element is not found. C++ Program #include<bits/stdc++.h> using namespace std; int main() { int num, search, found = 0; cout << "Enter the size of the vector:" << endl; cin >> num; vector<int> v(num); cout << "Enter " << num << " elements in vector:" << endl; for(int i = 0; i < num; i++) { cin >> v[i]; } cout << "Enter element that you want to search:" << endl; cin >> search; for(int i = 0; i < num; i++) { ...
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Reverse a String in C

Reverse String in C

Reverse a String in C

This C program reverses a given string using a simple two-pointer technique. It swaps characters from both ends until the middle is reached.

✅ C Program Code:


#include <stdio.h>
#include <string.h>

void reverse(char str[])
{
    int start = 0;
    int end = strlen(str) - 1;
    int temp;
    while (start < end)
    {
        temp = str[start];
        str[start] = str[end];
        str[end] = temp;
        start++;
        end--;
    }
}

int main()
{
    char str[100];
    printf("Enter the string:\n");
    scanf("%[^\n]", str);
    printf("Before reversing the string: %s\n", str);
    reverse(str);
    printf("After reversing the string: %s", str);
}

📌 How It Works:

  • reverse(): Swaps characters from start and end using a while loop until the full string is reversed.
  • scanf("%[^\n]", str): Reads a line of input including spaces.
  • main(): Takes user input, prints original and reversed string.

💻 Sample Output:

Enter the string:
Hello World
Before reversing the string: Hello World
After reversing the string: dlroW olleH

🔍 Keywords:

reverse string in C, string handling in C, two-pointer approach C, beginner string program, C logic examples, character array reverse

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