What are the parameter passing methods?
The mechanism used to pass  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout to a procedure (subroutine) or function. The most common methods are to  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout the value of the actual parameter ( actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout by value), or to pass the  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout of the  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout location where the actual parameter is stored (call by  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout).


What is call by value method?
In the call by value method the  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout arguments are copied to the  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout arguments, hence any  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout performed by function on  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout doesn’t affect actual parameters.


What is call by reference method?
Unlike call by value, in this method,  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout of actual arguments (or parameters) is  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout to the  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout parameters, which means any  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout performed on formal  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout affects the value of  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout parameters.


what are the different aspects of function calling?
A function may or may not accept any argument. It may or may not return any value. Based on these facts, There are four different aspects of function calls.
function  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout arguments and  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout return  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout
function without  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout and with return value
function  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout arguments and without return value
 actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout with arguments and  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout return value


find the missing terms?
#include
int sum();
void  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout()
{
int  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout;
printf("\nGoing to calculate the sum of two numbers:");
result = sum();
printf("%d",result);
}
int  actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout()
{
 actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout a,b;
printf("\nEnter two numbers");
scanf("%d %d",&a,&b);
 actualaddressargumentscallformalfunctionintmainmemoryoperationparameterspasspassedreferenceresultreturnsumvaluewithwithout a+b;
}