In C++, the **`putchar()` function** writes a character to stdout.

# Syntax

The `putchar()` function takes an integer argument to write it to stdout. The integer is converted to *unsigned char* and written to the file. 

Upon success, the `putchar()` function returns the character represented by `ch`; upon failure, the function returns *EOF* and sets the error indicator on stdout.

> `putchar()` is defined in the `<cstdio>` header file.

# Code

The example below outputs characters equivalent to the integer values ranging from $65-75$ (i.e., the first ten uppercase letters):​

#include <iostream>
using namespace std;
#include <cstdio>

int main()
{
    for (int i=65; i<75; i++)
    {
        /*  Writes the equivalent character */
        putchar(i);
        putchar(' ');
    }
    
    return 0;
}

What is the putchar() function in C++?

Writes a character to stdout; returns the character on success or EOF on failure.