Program without Argument but with Return Value.

In this program, the task is to create a program having a function without arguments but with return values . So, we create a function outside the main function named as func() . In this function , int func is used as the function returns a variable of type int . Moreover , the function does not accept any variable or arguments . A function can only return a single value. With line a = func() , the program passes its control to function & when function is executed , then it passes the control  to main function . Then , we will display the output after calling of the function . 

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#include<stdio.h>
#include<string.h>
#include<conio.h>
int func();
void main()
{     clrscr();
int a;
printf("enter value of a = ");
scanf("%d",&a);
a = func();
printf("\n\n value of a after calling of function = %d",a);
getch();
}

int func()
{   int b =10;
printf("value of b inside function = %d",b);
return b;
}