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Example of function Type 1 Categories function with no arguments no return type
C Language
Publish Date: April, 26-2019
Functions are an essential part of C programming that help make programs modular and reusable. In this example, we demonstrate a Type 1 function — a function with no arguments and no return type. Such functions do not take input parameters or return any value to the calling function. All operations are performed inside the function itself.
The following program defines a simple sum() function that takes two numbers as input and displays their sum. It uses Turbo C/C++ features like clrscr() and getch() for screen handling.
C Program: Function with No Arguments and No Return Type
#include <stdio.h>
#include <conio.h> // Used for clrscr() and getch() in Turbo C/C++
// 1. Function Declaration (Prototype)
void sum(void);
int main() {
// clrscr(); // Clears screen in Turbo C/C++
printf("--- Main Program Starts ---\n");
// Function Call
sum();
printf("\n--- Main Program Ends ---\n");
// getch(); // Holds screen in Turbo C/C++
return 0;
}
// 2. Function Definition
void sum(void) {
int a, b, c;
printf("Enter the first number (a): ");
scanf("%d", &a);
printf("Enter the second number (b): ");
scanf("%d", &b);
c = a + b;
printf("The sum (a + b) is: %d", c);
}
Explanation
-
Function Declaration:
void sum(void);tells the compiler that the functionsumexists and takes no parameters. -
Function Call:
Inmain(), the functionsum()is called. The control jumps to thesum()function. -
Function Definition:
Inside the function, variablesa,b, andcare declared. The program takes input foraandb, adds them, and displays the result. -
Turbo C/C++ Functions:
-
clrscr()clears the output screen. -
getch()holds the screen until a key is pressed.
-
This is one of the simplest examples of function type 1 (no arguments, no return type) in C.
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