Command box disappears after pressing Enter in C Program

[splodger15]

Hello,

I recently just finished my C app nothing special just a little app for personal use but when I press ENTER the command box disappears and my program just exits before it has done anything.I am running a Xp Home OS

Also I am using a IDE enviroment is this the best way.

[sicarie]

What is the program supposed to do? Is it supposed to output something, or does it just work in the background? If it just works in the background, did you check to see if it actually performed its function?

[splodger15]

What is the program supposed to do? Is it supposed to output something, or does it just work in the background? If it just works in the background, did you check to see if it actually performed its function?

Basically its a simple program which outputs 6 random numbers but you press ENTER and it just disappears no random numbers appear

[sicarie]

Can i see the code from your main() function?

[splodger15]

Can i see the code from your main() function?

Yeh sure:

int main()
 
{
    int numbers[RANGE]; //Array that holds the balls
    int i,b;
    unsigned long d; //Delay Variable
 
    printf("LOTTO PICKER\n");
 
    seedrnd();
 
    /*Initialize the array*/
 
    for(i=0;i<RANGE;i++)
    numbers[i]=0;
 
    printf("Press ENTER to pick this weeks LOTTO numbers");
    getchar();
 
    /*Draw the numbers*/
 
    printf("\nHere they come: ");
    for(i=0;i<BALLS;i++)
    {
        for(d=0;d<=DELAY;d++);  //Pause Here
 
        /*Picks a random numbers and checks to see whether
        it has already been picked*/
 
        do
        {
            b=rnd(RANGE); //Draw Number
        }
        while(numbers[b]);
 
        numbers[b]=1;
        printf("%i ",b+1);
    }
 
    printf("\n\nGood luck in the draw!\n");
}
 
/* Generate a random value */
 
int rnd(int range)
{
    int r;
 
    r=rand()%range;
    return(r);
}
 
 
void seedrnd(void)
{
    srand((unsigned)time(NULL));
}
 

[sicarie]

Yeh sure:

int main()
 
{
    int numbers[RANGE]; //Array that holds the balls
    int i,b;
    unsigned long d; //Delay Variable
 
    printf("LOTTO PICKER\n");
 
    seedrnd();
 
    /*Initialize the array*/
 
    for(i=0;i<RANGE;i++)
    numbers[i]=0;
 
    printf("Press ENTER to pick this weeks LOTTO numbers");
    getchar();
 
    /*Draw the numbers*/
 
    printf("\nHere they come: ");
    for(i=0;i<BALLS;i++)
    {
        for(d=0;d<=DELAY;d++);  //Pause Here
 
        /*Picks a random numbers and checks to see whether
        it has already been picked*/
 
        do
        {
            b=rnd(RANGE); //Draw Number
        }
        while(numbers[b]);
 
        numbers[b]=1;
        printf("%i ",b+1);
    }
 
    printf("\n\nGood luck in the draw!\n");
}
 
/* Generate a random value */
 
int rnd(int range)
{
    int r;
 
    r=rand()%range;
    return(r);
}
 
 
void seedrnd(void)
{
    srand((unsigned)time(NULL));
}
 

Have you tried putting some sort of "press enter to continue" catch at the end? A scanf() statement that you just exit after to keep the console (output) window open?

[splodger15]

Have you tried putting some sort of "press enter to continue" catch at the end? A scanf() statement that you just exit after to keep the console (output) window open?

How would I go about doing it its just that my class have only just started C and we had this project to write our own C program so my knowledge on this is very slim.

Thanks

[sicarie]

How would I go about doing it its just that my class have only just started C and we had this project to write our own C program so my knowledge on this is very slim.

Thanks

Just stick a getchar() (like in line 18 above) above your return 0;.

(This could also be a scanf(), or other method that reads from standard input.)

[splodger15]

Thanks alot its fully working now.

Thanks again

[sicarie]

Thanks alot its fully working now.

Thanks again

Great! Please post again if you run into another issue.

[weaknessforcats]

You wouldn't be using Visual Studio.NET by any chance???

If not stop reading here.

The default build for Visual Studio is debug. That is, code is put in your .exe to support the debugger. When you select Start, Visual Studio sees the debug code and just runs the program on the assumption that you have inserted necessary pauses, like breakpoints.

However, you can select Start Without Debugging. In this case, Visual Studio sees the debug code but understands that you are not using your debugger. So after main() completes, it pauses execution with Press any key to continue.... No need to add phony stops in your code.