C function argument and return values

Here we will see what are the different types of C functions based on the return values and arguments.

So a function either can take some arguments, or nothing is taken. Similarly, a function can return something, otherwise does not return anything. So we can categorize them into four types.

• Function with No argument and No return type.
• Function with No argument and Return something.
• A function that takes argument but returns nothing.
• Functions that take an argument and also return something.

Example

#include <stdio.h> void my_function() {    printf("This is a function that takes no argument, and returns nothing."); } main() {    my_function(); }

Output

This is a function that takes no argument, and returns nothing.

Here this function is not taking any input argument, and also the return type is void. So this returns nothing.

Example

#include <stdio.h> int my_function() {    printf("This function takes no argument, But returns 50
");    return 50; } main() {    int x;    x = my_function();    printf("Returned Value: %d", x); }

Output

This function takes no argument, But returns 50 Returned Value: 50

Here this function is not taking any input argument, but its return type is int. So this returns a value.

Example

#include <stdio.h> void my_function(int x) {    printf("This function is taking %d as argument, but returns nothing", x);    return 50; } main() {    int x;    x = 10;    my_function(x); }

Output

This function is taking 10 as argument, but returns nothing

Here this function is taking an input argument, but its return type is void. So this returns nothing.

Example

#include <stdio.h> int my_function(int x) {    printf("This will take an argument, and will return its squared value
");    return x * x; } main() {    int x, res;    x = 12;    res = my_function(12);    printf("Returned Value: %d", res); }

Output

This function is taking 10 as argument, but returns nothing

Here this function is taking any input argument, and also returns value.