Pass by Value Program in C++

This C++ program illustrates how to pass a variable to a function by value. The value of the parameter can not be changed by using this method since we do not pass the variable’s address by either referencing operator (&) or using pointer.

Here is the source code of the C++ program illustrates how to pass a variable to a function by value. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Illustrate Pass by Value

```
 */
```
```
 
```
```
#include <iostream>
```
```
 
```
```
void passByValue(int data)
```
```
{
```

    std::cout << "Value of data in passByValue( ) is "

```
              << data << std::endl;
```
```
    data = 20;
```

    std::cout << "Value of data is changed now to "

```
              << data << std::endl;
```
```
    return;
```
```
}
```
```
 
```
```
int main()
```
```
{
```
```
    int data = 10;
```
```
 
```
```
    std::cout << "Value of data is "
```
```
	      << data << std::endl;
```
```
    /* Variable data passed by value */
```
```
    passByValue(data);
```
```
    /* Value of data is still 10 */
```

    std::cout << "Value after calling passByValue() is "

```
              << data;
```
```
    return 0;
```
```
}
```

$ a.out
Value of data is 10
Value of data in passByValue( ) is 10
Value of data is changed now to 20
Value after calling passByValue( ) is 10

Sanfoundry Global Education & Learning Series – 1000 C++ Programs.

If you wish to look at all C++ Programming examples, go to C++ Programs.

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