The swap function is used in C language to exchange the values of two variables. Its function prototype is void swap(int a, int b), where a and b are two integer pointers pointing to the two variables whose values need to be exchanged. Value exchange can be achieved by calling the swap function and passing the variable address.
The meaning of swap in C language
swap is a function in C language, used to exchange two the value of a variable. The function prototype is:
<code>void swap(int *a, int *b);</code>
Among them, a and b are two integer pointers, pointing to the two variables that need to exchange values.
How to use the swap function
To use the swap function to exchange the values of two variables, you can follow the following steps:
Example
The following code snippet demonstrates how to use the swap function:
<code>#include <stdio.h> int main() { int a = 10; int b = 20; printf("Before swap: a = %d, b = %d\n", a, b); swap(&a, &b); printf("After swap: a = %d, b = %d\n", a, b); return 0; }</code>
The output result is:
<code>Before swap: a = 10, b = 20 After swap: a = 20, b = 10</code>
Working principle
The swap function uses pointers to exchange the values of variables. The pointer passed to the swap function points to the variable whose value is to be swapped. Inside the function, it uses the indirect addressing operator (*) to access variables and exchange their values.
Notes
When using the swap function, you need to pay attention to the following:
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