The **`putc`** function in C writes a character to any output stream and returns an integer value. It is a standard function in C and can be used by including the `<stdio.h>` header file.

# Prototype
```c
int putc(int ch, FILE *stream)
```
# Parameters and return value



## Parameters
- `int`: The integer representation of the character to be written to the output stream.

- `stream`: A *file stream* or *standard output stream* identified by a pointer to the *FILE* object.

## Return value
- `int`: Integer casting of the character written by `putc`. 

If the write operation is unsuccessful due to an error or the end of a file is reached, `EOF` is returned.

# Code

#include <stdio.h>

int main() {
  char c;
  int ret;
  
  c = 'g';
  ret = putc(c, stdout); //ret stores the integer representation of the character
 
  return 0;
}

In the above code, the value `g` stored in the character variable `c` is displayed on standard output by the `putc` function and the corresponding integer value `103` is stored in the variable `ret`.

#include <stdio.h>

int main() {
  char c;
  FILE *fp = fopen("new.txt","w");
  c = 'A';
  putc(c, fp);
  fclose(fp);

  //to test whether putc was successful
  FILE *fp2 = fopen("new.txt","r");
  printf("%c", getc(fp));
  return 0;
}

In this example, the text file `new.txt` opens in *write* mode and is assigned to a file pointer `fp`. The content of variable `c` i.e., `A`, is written at the position pointed to `fp` in the file using the `putc` function.

> To test whether the write was successful to the file, it should be opened in read mode, and a character read using the `getc` function. The character read is then displayed on standard output.


What is putc in C?

The putc function writes a character to an output stream, returning its integer value or EOF on failure.