Design a function to search given character in given string in c

Searching for a Character in a String in C: Function Design

"Design a function to search a given character in a given string" means creating a function that takes a string and a character as input, and then searches for the given character within the string. The function should return the index of the first occurrence of the character in the string, or -1 if the character is not found in the string.

To search for a character in a string, you can use a loop to iterate over each character in the string, comparing it to the target character. If the target character is found, you can return its index. If the end of the string is reached without finding the character, you can return -1 to indicate that the character was not found.

We can use the following steps:

Define the function prototype:

char* search_character(const char* string, char character);

This function takes a string and a character as input and returns a pointer to the first occurrence of the character in the string, or NULL if the character is not found.

Implement the function body:

char* search_character(const char* string, char character) {
  // Iterate through the string until we find the character or reach the end of the string.
  for (int i = 0; string[i] != '\0'; i++) {
    if (string[i] == character) {
      return &string[i];
    }
  }

  // If we reach the end of the string without finding the character, return NULL.
  return NULL;
}

This function works by iterating through the string until it finds the character or reaches the end of the string. If the character is found, the function returns a pointer to the character. Otherwise, the function returns NULL.

Test the function:

#include <stdio.h>

int main() {
  char string[] = "Hello, world!";
  char character = 'l';

  // Search for the character in the string.
  char* found_character = search_character(string, character);

  // If the character was found, print its index. Otherwise, print a message.
  if (found_character != NULL) {
    printf("The character '%c' was found at index %d.\n", character, found_character - string);
  } else {
    printf("The character '%c' was not found in the string.\n", character);
  }

  return 0;
}

Output:

The character 'l' was found at index 2.

This is just a simple example of a function to search a given character in a given string in C. You can modify the function to meet your specific needs, such as searching for multiple characters or searching for a character within a substring.

Further Reading:

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