Putchar Function In C

Benefits of C functions

The benefits of C functions are as follows:

• ✅ We may avoid repeatedly writing the same logic or code in a program by utilizing functions.
• ✅ C functions can be called from anywhere in a program and at any number of times.
• ✅ When a huge C program is broken up into several functions, we can simply follow it.
• ✅ The primary accomplishment of C functions is reusability.
• ✅ Yet in a C application, invoking functions always adds overhead.

Aspects of Function

A C function has three different characteristics:

• ✅ Function announcement In order to inform the compiler of the function name, function arguments, and return type, a function must be declared globally in a c program.
• ✅ Using a function throughout the program, functions can be invoked from anywhere. Function declaration and function calling cannot have different argument lists. The number of functions that must be sent must match the number indicated in the function declaration.
• ✅ Define the function the actual statements that must be executed are included there. The most crucial component is the one over which the function has control. Here, it is important to note that the function can only return one value.

The following is the syntax for creating a function in the C language:

return_type function_name(data_type parameter...){  
//code to be executed  
}

Different Functions

In C programming, functions are categorized into two main types:

• ✅ One type consists of built-in functions listed in C header files such as scanf, printf, gets, puts, ceiling, floor, and more.
• ✅ The other type includes user-defined functions, which programmers develop to enhance code reusability, streamline the codebase, and reduce the intricacy of extensive applications.

Return Value

Depending on its purpose, a C function may or may not have a return value. If a function does not need to return any values, the return type should be specified as void.

Let's examine a simple C function example that does not return a value.

void hello(){  
printf("hello c");  
}

Utilize any data type, like int, long, char, etc., in case you want the function to produce a specific output. The type of data that the function returns dictates the return type.

Let's examine a simple C function illustration that produces an integer value.

int get(){  
return 10;  
}

The data type that should be specified in the given illustration is int because the purpose is to return 10 as the output value. Opt for float as the function's return type if the intention is to return a decimal value like 10.2, 3.1, 54.5, or any other number of that nature.

float get(){  
return 10.2;  
}

To retrieve the value of the function, it is necessary to invoke the function.

Various characteristics of invoking functions

An argument may or may not be accepted by a function. It could or might not give back any value. These facts lead to the conclusion that function calls have four different characteristics.

• ✅ Without return value and without arguments
• ✅ Function with a return value and no parameters
• ✅ Function that takes parameters but doesn't return anything
• ✅ Function that has parameters and a result

To output a character of the unsigned char data type to the standard output in C, employ the putchar(int char) function. The argument passed to this function should be the specific character needed to be displayed.

Syntax:

int putchar(int char)

Argument: The symbol to be displayed on the standard output, char, is a mandatory parameter for this function.

The return value of this function is an unsigned char representing the character that was displayed on the standard output. If an error occurs, it will return EOF along with the character.

The putchar function is utilized in the upcoming illustrations.

// C program to demonstrate putchar() method
#include <stdio.h>
int main()
{
	// Get the character to be written
	char ch = 'J';
	// Write the Character to stdout
	putchar(ch);
	return (0);
}

Output

J
…..
Process executed in 0.11 seconds
Press any key to continue

Explanation

In the previously shown C program example, the character 'ch' was set to 'J' initially. Following this assignment, the putchar function was invoked, resulting in the expected output of the character 'J'.

Another example:

// C program to demonstrate putchar() method
#include <stdio.h>
int main()
{
	// Get the character to be written
	char ch = '0';
	// Write the Character to stdout
	for (ch = '0'; ch <= '9'; ch++)
		putchar(ch);
	return (0);
}

Output

0123456789
……………….
Process executed in 0.12 seconds
Press any key to continue.

Explanation:

In the previous C program example, we observe the initialization of the character 'ch' to '0'. Following this, the putchar function is invoked within a for loop, resulting in the anticipated output of the character sequence '0123456789'.