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  #1  
Old April 26th, 2003, 08:41 PM
kmr6655 kmr6655 is offline
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Question I/O error, extra text in output

Hello everyone,

Below is a small program that ends when -999 is entered, then a summary is printed. However, my program is printing the -999 in the summary and then prints out random characters.

Can anyone tell me how to stop the -999 from being output in the summary, as well as the other characters? I thought that the carot added to the scanf would prevent the -999 from printing. Or is that just text?

As always, your help is appreciated!

#include <stdio.h>
void main (void)



{

int x,account[5];
float balance[5];
char name[5][30];


printf("Enter client account number, name and balance.\n");

printf("Enter -999 to end input.\n\n");


for (x=0; x <5 ; x++)


{

printf("? ");


scanf("%i[^-999]",&account[x]);

if(account[x] == -999)

{
fflush(stdin);
break;

}


scanf("%30s",name[x]);


scanf("%f",&balance[x]);



}



printf("\n\nACCOUNT \tLASTNAME \tBALANCE\n");



for (x=0; x<5; x++)

{

printf("%i %20s %14.2f \n", account[x], name[x], balance[x]);


}

}

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  #2  
Old April 27th, 2003, 12:44 AM
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>> my program is printing the -999 in the summary and then prints out random characters.
The reason I suspect you're getting random stuff is because you haven't explicitly initialized the arrays account, balance or name.

>> I thought that the carot added to the scanf would prevent the -999 from printing
scanf() is used for accepting user input, not printing. Your ^-999 filter doesn't work the way you think, so you might as well remove it. With that said, I would handle it by putting code to break out of the printing loop, if -999 is encountered.

After implementing those two suggestions, your code should look something like this :
Code:
#include <stdio.h>
#include <string.h>
int main (void)
{
    int x,account[5];
    float balance[5];
    char name[5][30];

    /* First initialize your arrays */
    for (x = 0; x < 5; x++) {
        account[x] = 0;
        balance[x] = 0;
        strcpy(name[x], "");
    }

    printf("Enter client account number, name and balance.\n");
    printf("Enter -999 to end input.\n\n");

    for (x=0; x <5 ; x++)
    {
        printf("? ");
        scanf("%d",&account[x]);
        if(account[x] == -999)
        {
            fflush(stdin);
            break;
        }
        scanf("%.30s",name[x]);
        scanf("%f",&balance[x]);
    }

    printf("\n\nACCOUNT \tLASTNAME \tBALANCE\n");
    for (x=0; x<5; x++)
    {
        if (account[x] == -999)
            break;
        printf("%i %.30s %14.2f \n", account[x], name[x], balance[x]);
    }
    return 0;
}


Please note that I typed the above code off the top of my head, so there may be some minor syntax errors. HTH

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Old April 27th, 2003, 07:15 AM
kmr6655 kmr6655 is offline
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Thanks so much!

I'm wondering why we are initializing within a for loop?

Couldn't we just initialize without the loop?

Kathy

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Old April 27th, 2003, 07:28 AM
kmr6655 kmr6655 is offline
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It works great now. Moving the if statement in the third loop to above the printf statement got rid of the -999, and the extra garbage that came with it.

One of these days I'm going to get this stuff!

Kathy

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