{"id":251254,"date":"2024-04-04T21:44:42","date_gmt":"2024-04-04T21:44:42","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/?p=251254"},"modified":"2024-04-04T21:44:42","modified_gmt":"2024-04-04T21:44:42","slug":"how-does-pass-by-value-work-c-2","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-does-pass-by-value-work-c-2\/","title":{"rendered":"How does pass by value work C++?"},"content":{"rendered":"

In C++, pass-by-value is a method used to transfer arguments to a function by making a copy of the value and passing it to the function. When a parameter is passed by value, any changes made to the parameter within the function do not affect the original value that was passed. Instead, the function operates on a local copy of that value.<\/p>\n

So, how does pass-by-value work in C++?<\/strong> When a function is called with arguments passed by value, a new copy of those arguments is created within the function’s scope. This copy is then modified within the function, leaving the original value untouched.<\/p>\n

To illustrate this concept, let’s consider an example:<\/p>\n


\n#include <iostream>
\nusing namespace std;
\n
\nvoid increment(int num) {
\n    num++;  \/\/ Modifies the local copy of the value without affecting the original
\n    cout << \"Inside the function: \" << num << endl;
\n}
\n
\nint main() {
\n    int number = 10;
\n    increment(number);
\n    cout << \"Outside the function: \" << number << endl;
\n    return 0;
\n}
\n<\/pre>\n
In this example, we have a function increment<\/code> that takes an integer num<\/code> as a parameter. Within the function, the value of num<\/code> is incremented by one. After the function call, both inside the function and outside the function, the value of num<\/code> is printed.<\/p>\n
The output of this code would be:<\/strong><\/p>\n

\nInside the function: 11
\nOutside the function: 10
\n<\/pre>\n
As you can see, the value of num<\/code> inside the function is modified to 11, but the original value of number<\/code> outside the function remains unchanged at 10. This is because when number<\/code> is passed to the function, a copy of its value is created and modified within the function’s scope. The original number<\/code> variable is not affected by this modification.<\/p>\n
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