The **`strchr()` function** is a built-in library function declared in the `string.h` header file.

It finds the first occurrence of a character in a string and returns a pointer to the found character, or null pointer, if no such character is found. 

`strchr()` takes string as a first argument, character as a second, and returns a pointer to `char`.

```c
char* strchr(const char* str, int ch);
```

## Case 1

```c
const char* string = "hello";
strchr(string, 'l'); // returns pointer to the third character of the string
```

```c
const char* string = "hello";
strchr(string, 'a'); // returns NULL
```

#include <stdio.h>
#include <string.h>
 
int main()
{
  const char *str = "To be, or not to be: that is the question";
  
  char target = 't';
  const char *result = str;
  
  // Find the first occurence of the target
  result = strchr(result, target);
  while (result != NULL) {
    printf("Found '%c' starting at '%s'\n", target, result);
 
     // Increment result, otherwise we'll find target at the same location
    ++result;
    // Find the next occurence of the target
    result = strchr(result, target);
  }
}

What is strchr in C?

The strchr() function is a built-in library function declared in the string.h header file. It finds the first occurrence of a character in a string and returns a pointer to the found character, or null pointer, if no such character is found. 

What is strchr in C?

Syntax

Cases

Case 1

Case 2

Code