mvc++ 6.0 scanf probs

Effigy · 09-02-2002

I'm just starting and working on some very easy programs. I was doing a few little programs that use the scanf() function, such as taking the input of 4 numbers and printing out the average or a program that subtracts 2 numbers from one another, and couldnt get anything to work. I'm using ms visual c++ 6.0 on win98.

So then I tried this program:
#include <stdio.h>

main()
{
int a;
scanf("enter a value %d ", &a);
printf("a contains %d ", a);
return 0;
}

The value of a (and all values I try scan f'ing in) ends up being something ridiculous like -823460123. Any ideas what is up with this?

http://cboard.cprogramming.com/showt...t=scanf+result This thread says scanf has problems...is this my case?

I've tried the suggestions in these threads:
http://cboard.cprogramming.com/showt...t=scanf+result

and another 1 I cant find the link to now. Any help appreciated.

**sean345** · 09-02-2002

This is how you should use scanf:

Code:

int main(void){
    int a = 0;
    printf("Enter a value ");
    scanf("%d", &a);
    printf("a is %d\n", a);
    return 0;
}

- Sean

**Hammer** · 09-02-2002

>>This is how you should use scanf:
You should also check the return code from scanf() to ensure it did what you asked it to.

Effigy · 09-02-2002

Thanks guys, that seemed to do it. Is it because I wasn't initiallizing a to 0?

**purple** · 09-02-2002

No, your major problem is that you are trying to use scanf for both input and output.

scanf: inputs (scans in) values
printf: outputs (prints out) values and/or strings of text

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