{"id":48186,"date":"2024-04-15T22:37:35","date_gmt":"2024-04-15T22:37:35","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=48186"},"modified":"2024-04-15T22:37:35","modified_gmt":"2024-04-15T22:37:35","slug":"a-function-can-receive-information-either-by-value-or-by","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/a-function-can-receive-information-either-by-value-or-by\/","title":{"rendered":"A function can receive information either by value or by . . . . . . . ."},"content":{"rendered":"

[amp_mcq option1=”Reference” option2=”Address” option3=”Pointer” option4=”Value” correct=”option1″]<\/p>\n

The correct answer is: A. Reference<\/strong><\/p>\n

A reference is a variable that stores the address of another variable. When a function receives a reference to a variable, it can modify the value of the variable in the calling function.<\/p>\n

A value is a copy of the data stored in a variable. When a function receives a value, it cannot modify the value of the variable in the calling function.<\/p>\n

An address is the location of a variable in memory. When a function receives an address, it can access the variable in the calling function.<\/p>\n

A pointer is a variable that stores the address of another variable. Pointers are often used to pass data to functions.<\/p>\n

Here is an example of how a function can receive information by value:<\/p>\n

“`c
\nvoid change_value(int x) {
\n x = 10;
\n}<\/p>\n

int main() {
\n int a = 5;
\n change_value(a);
\n printf(“%d\\n”, a); \/\/ prints 5
\n}
\n“`<\/p>\n

In this example, the function change_value<\/code> receives the value of the variable a<\/code>. The function then changes the value of a<\/code> to 10. However, the change is not reflected in the calling function, because the function only received a copy of the value of a<\/code>.<\/p>\n

Here is an example of how a function can receive information by reference:<\/p>\n

“`c
\nvoid change_reference(int x) {
\n <\/em>x = 10;
\n}<\/p>\n

int main() {
\n int a = 5;
\n change_reference(&a);
\n printf(“%d\\n”, a); \/\/ prints 10
\n}
\n“`<\/p>\n

In this example, the function change_reference<\/code> receives a reference to the variable a<\/code>. The function then changes the value of a<\/code> to 10. This change is reflected in the calling function, because the function received a reference to a<\/code>.<\/p>\n","protected":false},"excerpt":{"rendered":"

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