Function with no argument but return something in C

1.  There could be occasions where we may need to design functions that may not take any arguments but returns a value to the calling function. A example for this is getchar function it has no parameters but it returns an integer an integer type data that represents a character.
   Syntax :

   Function declaration : int function();
   Function call : function();
   Function definition :
                    int function()
                    {
                        statements;
                         return x;
                     }
       

   
   

   // C code for function with no arguments  // but have return value #include <math.h> #include <stdio.h>    int sum(); int main() {     int num;     num = sum();     printf("\nSum of two given values = %d", num);     return 0; }    int sum() {     int a = 50, b = 80, sum;     sum = sqrt(a) + sqrt(b);     return sum; }

   Output:

   Sum of two given values = 16