#include <stdio.h>

int sumPlusTwo(int *number1, int *number2){    
    return *number1 + *number2 + 2;
}

void numPlusOne(int *number1){
    *number1 = *number1 + 1;
}

void swap (int *number1, int *number2){
    int temp = *number1;
    *number1 = *number2;
    *number2 = temp;
}

int main(void){

    int num1 = 13;
    int num2 = 1;
    
    printf("%d + %d + 2 = %d\n", num1, num2, sumPlusTwo(&num1, &num2)); //
    swap(&num1, &num2); // num1 = ; num2 = 
    numPlusOne(&num1); // num1 + 1 = 2
    numPlusOne(&num1); // num1 + 1 = 3
    printf("%d + %d + 2 = %d\n", num1, num2, sumPlusTwo(&num1, &num2)); // 
    
    return 0;
}