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What is the call by value in function?

2 New Member
what is the call by value in function??
Mar 5 '13 #1
5 22682
divideby0
131 New Member
Call by value passes a copy of a variable into a function. The copy can be modified within the function, but the original value isn't changed.

Expand|Select|Wrap|Line Numbers
  1. void foo(int x)
  2. {
  3.    x = 5; // modification is local only
  4. }
  5.  
  6. ...
  7.  
  8. int y = 0;
  9. foo(y); // upon return, y is still 0
  10.  
Mar 5 '13 #2
Sherin
77 New Member
The call by value the actual arguments are copied to the formal arguments, hence any operation performed by function on arguments doesn’t affect actual parameters. Lets take an example to understand this:

Expand|Select|Wrap|Line Numbers
  1. #include <stdio.h>
  2. int increment(int var)
  3. {
  4.     var = var+1;
  5.     return var;
  6. }
  7.  
  8. int main()
  9. {
  10.    int num1=10;
  11.    int num2 = increment(num1);
  12.    printf("num1 value is: %d", num1);
  13.    printf("\nnum2 value is: %d", num2);
  14.  
  15.    return 0;
  16. }
Feb 25 '21 #3
prasanthp
2 New Member
In the call by value method, we pass a copy of the parameter is passed to the functions. For these copied values a new memory is assigned and changes made to these values do not reflect the variable in the main function.
Mar 18 '21 #4
Riya Bajpai
18 New Member
The call by value method of passing arguments to a function copies the actual value of an argument into the formal parameter of the function. In this case, changes made to the parameter inside the function have no effect on the argument.
Mar 23 '23 #5
zack23
2 New Member
In programming, call by value is a method of passing arguments to a function. When a function is called with arguments passed by value, a copy of the argument is created and passed to the function. This means that any changes made to the parameter within the function do not affect the original argument in the calling code.

For example, if a function is called with an integer value of 5, the function receives a copy of the value 5. If the function changes the value of the parameter to 10, the original value of 5 in the calling code is not affected.

This is different from call by reference, where a reference to the original argument is passed to the function. In call by reference, any changes made to the parameter within the function affect the original argument in the calling code.

Understanding call by value and call by reference is important in programming because it affects how functions manipulate data and how data is passed between functions.

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Mar 31 '23 #6

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