int count_character(char *string, char character, int *count) {
  // Initialize the count variable.
  *count = 0;

  // Iterate over the string.
  while (*string != '\0') {
    // If the current character matches the given character, increment the count.
    if (*string == character) {
      (*count)++;
    }

    // Move to the next character in the string.
    string++;
  }

  // Return the count.
  return *count;
}

#include <stdio.h>

int count_character(char *string, char character, int *count);

int main() {
  // Declare a string.
  char string[] = "Hello, world!";

  // Declare a character to be searched for.
  char character = 'l';

  // Declare a variable to store the count of the occurrences of the character in the string.
  int count;

  // Call the count_character() function.
  count = count_character(string, character, &count);

  // Print the count.
  printf("The number of occurrences of the character '%c' in the string '%s' is %d.\n", character, string, count);

  return 0;
}

The number of occurrences of the character 'l' in the string 'Hello, world!' is 3.

 

Further Reading:

Concatenating Two Strings in C: A Step-by-Step Guide

Design a function to count given character in given string

Design a function to reverse the given string

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

Design a function to reverse the word in given string

Design a function replace the words in reverse order in a given string line

design a function to reverse data in between two location

Design a function to find string length in c

Design a Function to print the string character by character

Design a function to print the elements of a given integers array.

Design a function for bubble sort in c

Design a function to swapping of two number

Design a function to check the given number is Armstrong or not if Armstrong return 1 else 0

 

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Note: If you encounter any issues or specific errors when running this program, please let me know and I'll be happy to help debug them!