SRL Archive - C/C++ Help and Tutorials

This is the first program we wrote today and I need help understanding some stuff cause I am used to c++

#include <cstdio>
#include <cstdlib>
#include <time.h>
using namespace std;

int main(void)
{
	int deja;
	int num1, num2;

	printf("This program  gets 2 numbers from the user and randomly adds or subtracts them \n");
	printf("Enter 2 numbers and hit the ENTER key after each one \n");

	scanf("%i", &num1);
	scanf("%i", &num2);

	printf("%s, %i, %i \n", "The 2 numbers are : ", num1, num2);
	srand(time(NULL));
	deja = rand()%2;

	if (deja == 1)
	{
		printf("%s, %i \n","The sum is", num1 + num2);
	}
	else
	{
		printf("%s, %i \n", "The difference is" ,num1 - num2);
	}

	return EXIT_SUCCESS;
}

Everytime I run it, it does not print these first 2 lines

printf("This program  gets 2 numbers from the user and randomly adds or subtracts them \n");
printf("Enter 2 numbers and hit the ENTER key after each one \n");

Instead goes to the scanf and eventually waits for the user to enter both numbers before displaying the first 2 printf functions.

Also is there a different way to do the rand function that is easier to understand to someone who has never used it before?

When it runs, it shows this:

This program  gets 2 numbers from the user and randomly adds or subtracts them 
Enter 2 numbers and hit the ENTER key after each one 
The 2 numbers are : , 6, 5 
The difference is, 1

Is there a way to prevent it from showing the comma before the numbers?

One.. You're still writing C++ code.

Two.. You're includes are C++ includes. All C includes end in .h. Any include prepended with C is a C++ version of the C include.

Three.. To remove the comma, don't prepend the value with it:

#include <stdio.h>  //C++ :  CSTDIO
#include <stdlib.h> //C++: CSTDLIB
#include <time.h>  //C++ : CTIME

//using namespace std;

int main(void)
{
    int deja;
    int num1, num2;

    printf("This program  gets 2 numbers from the user and randomly adds or subtracts them \n");
    printf("Enter 2 numbers and hit the ENTER key after each one \n");

    scanf("%i", &num1);
    scanf("%i", &num2);

    printf("%s %i, %i \n", "The 2 numbers are:", num1, num2);
    srand(time(NULL));
    deja = rand()%2;

    if (deja == 1)
    {
        printf("%s %i \n","The sum is:", num1 + num2);
    }
    else
    {
        printf("%s %i \n", "The difference is:" ,num1 - num2);
    }

    return EXIT_SUCCESS;
}