Question

How to swap elements in int array with C++

Answer 1

#include <iostream>

void printArray(int arr[], int size) {
    for (int i = 0; i < size; i++) { 
	    std::cout << arr[i] << " ";
    }
}
 
int main () {
    int arr[] = { 1, 2, 3, 100, 5, 6, 7 };  
    int size = sizeof(arr) / sizeof(arr[0]);

    printArray(arr, size);
    std::cout << "\n";
                                                
    std::iter_swap(arr + 1, arr + 3); 
     
    printArray(arr, size);                                           
}
 
 
 
 
/*
run:
 
1 2 3 100 5 6 7 
1 100 3 2 5 6 7 
 
*/

 

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