Question

Write a void function that accepts two integer pointers and swaps the two integers pointed to by the pointers. Write the complete function including the function header

Answer 1

//Swap function

/*Function Declaration*/

void swap(int* , int*);

/*Function Definition*/

void swap(int *a, int *b){

   int temp;
   temp = *a;
   *a = *b;
   *b = temp;
}

Explanation:

In the above code snippet,

The return type is void and the swap function accepts two integer pointers, *a and *b.

Temperory variable 'temp' is used to swap the integers pointed by pointers.

Program.c

#include<stdio.h>
void swap(int* , int*);
void swap(int *a, int *b){
  
   int temp;
   temp = *a;
   *a = *b;
   *b = temp;
}

void main(){
  
   int value = 2, list = 8;
   int i;
   printf("\nBefore swap\n\n%d : %d\n",value,list);
  
   swap(&value,&list);
  
   printf("\nAfter swap\n\n%d : %d\n",value,list);
}

//Output

"//Swap function /*Function Declaration*/ void swap(int* , int*): /*Function Definition*/ void swap(int *a, int *b){ int temp: temp = *a: *a = *b: *b = temp: } Explanation: In the above code snippet, The return type is void and the swap function accepts two integer pointers, *a and *b. Temperory variable 'temp' is used to swap the integers pointed by pointers. Program.c #include < stdio.h > void swap(int* , int*): void swap(int *a, int *b){ int temp: temp = *a: *a = *b: *b = temp: } void main(){ int value = 2, list = 8: int i: printf(""\nBefore swap\n\n%d: %d\n"",value,list): swap(&value,&list): printf(""\nAfter swap\n\n%d: %d\n"",value,list): } //Output Before swap 2: 8 After swap 8: 2 Process exited after 0.01033 seconds Press any key to continue"