Function Arguments :-
1.Call by value method: In call by value method the actual arguments are copied to the formal arguments, so any operation performed by function on arguments doesn’t affect actual parameters.eg:-
#include<stdio.h>
int addition(int num1, int num2); /* function declaration */
int main()
{
int result; ; /* local variable definition */
int num1 = 14;
int num2 = 6;
result = addition(num1,num2); /* calling a function to get addition value */
printf("The addition of two numbers is: %d\n",result);
return 0;
}
int addition(int a,int b) /* function returning the addition of two numbers */
{
return a + b;
}
Output:The addition of two numbers is:20
2. Call by reference method: In this method, address of actual arguments is passed to the formal arguments, hence any operation performed on formal parameters will affects the value of actual arguments.
eg:-
#include<stdio.h>
int addition(int *num1, int *num2); /* function declaration */
int main()
{
int result ; /* local variable definition */
int num1 = 14;
int num2 = 6;
result = addition(&num1,&num2); /* calling a function to get addition value */
printf("The addition of two numbers is: %d\n",result);
return 0;
}
int addition(int *a,int *b) /* function returning the addition of two numbers */
{
return *a + *b;
}
output: The addition of two numbers is:20
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