Final answer:
The printf() function returns an int representing the number of characters written, and putchar() returns an int as well, which is either the cast character or EOF if an error occurs.
Step-by-step explanation:
The printf() function in C programming language returns an integer value that represents the number of characters written or a negative value if an error occurs. It is used to format and print the specified output to the standard output stream. For example, if we use printf() to print 'Hello' to the console, the return value will be the number of characters printed which is 5.
The data type returned by the printf() function in the C programming language is int. This function returns the number of characters successfully written to the standard output. If an error occurs, a negative number is returned. The putchar() function also returns an int, which is either the character written as an unsigned char cast to an int or EOF (End of File) if an error occurs.
Examples
- When you use printf() to print a string, and it successfully prints "Hello, World!", it should return the length of the string which is 13.
- If you use putchar() to write a single character 'A', it will return the ASCII value of 'A' which is 65, assuming no error occurred.