In C, the **`fprintf()`** function is used to print formatted data to a file. 

# Syntax
The general syntax of `fprintf()` is: 

int fprintf(FILE *stream, const char *format)

## Parameters

* **`stream`:** Pointer to the FILE object where data is to be printed

* **`format`:** This contains the data to be printed, written in a particular format using _format specifiers_ 

A **format specifier** is a unique character which is used to specify the data type of the value being read.

The format specifier follows the following prototype:

``` css
 %[flags][width][.precision][length]specifier
```


## Return Value
If the function successfully executes, it returns the total number of characters written to the file. If an error occurs, a negative number is returned.

# Example
The following examples will help clarify the use of the `fprintf()` function:




#include<stdio.h>

int main() {
    FILE * stream;

    stream = fopen("/file.txt", "w");
    // Printing a string
    char str[20] = "Hello World!";
    int x = fprintf(stream, "%s", str);  
    printf("\n %d characters successfully written to the file\n\n", x);

    // Printing an integer value
    int age = 22;
    x = fprintf(stream, "%d", age);  
    printf("\n %d characters successfully written to the file\n\n", x);
    fclose(stream);
    return 0;
}

How to use a printing formatted data to file using fprintf() in C

Use fprintf() in C to write formatted data to a file, returning character count or negative on error.