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#include <stdio.h>

void swap(int *a, int *b){
    int temp = *a;
    *a = *b;
    *b = temp;
}

int main(int argc, char *argv[]){
    int num1 = 5;
    int num2 = 10;
    printf("before swap: %d, %d\n", num1, num2);
    swap(&num1, &num2);
    printf("after swap: %d, %d\n",num1, num2);
    return 0;
}