# <string.h>

**[<string.h>](https://en.cppreference.com/w/c/header/string)** provides null-terminated string functions (`strlen`, `strcpy`, `strcat`, `strcmp`) and memory operations (`memcpy`, `memmove`, `memset`). Avoid `strcpy`/`strcat` (unsafe); use bounded variants or `snprintf` instead.

The `mem*` functions work on raw bytes; the `str*` functions assume null termination.

## Example

This example tokenizes a CSV line using `strtok` and measures each field.

```c
// compile: gcc -o stringexample stringexample.c
// run: ./stringexample
// description: tokenize CSV line by comma and print each field

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

int main() {
    char line[] = "alice,30,engineer,london";
    char* tok = strtok(line, ",");
    int field = 0;
    
    while (tok) {
        printf("field %d: \"%s\" (len %zu)\n", field++, tok, strlen(tok));
        tok = strtok(NULL, ",");
    }
    
    return 0;
}
```