Scanf specific Characters into array in C

Question

I am currently taking a basic C course and I was wondering why my code below doesn't run.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{ 
    char string[4];

    printf("Enter some text\n");
    scanf(" %c %c %c", &string[0], &string[1], &string[2]);

    printf("You Entered ");

    int i;
    for (i = 0; i < 4; i++){
        printf("%c",string[i]);
    }

    return 0;
}

Xcode said there is an errr with my scanf line.

I was hoping to type in "a b c d" and expect a "You entered abcd";

"(lldb)" "error: 'apropos' must be called with exactly one argument." — Arrow
– Arrow, Commented Feb 20, 2014 at 19:31
Based on that error, why do you think the problem is with the scanf line? — Steven Hansen
– Steven Hansen, Commented Feb 20, 2014 at 19:34
I used Xcode to go to Product>Run if that helps. Also, I not sure what that error is saying, especially the apropos part. — Arrow
– Arrow, Commented Feb 20, 2014 at 19:39

stvsmth · Accepted Answer · 2014-02-20 20:24:09Z

1

This code should run (albeit with a bug). I suspect you need to configure the Xcode build options correctly.

As for the bug, you have an array of four chars, but you are only scanning for three. Add another %c and &string[3] to your scanf line.

Here's an ideone snippet showing the modified code in action

#include <stdio.h>

int main()
{ 
    char string[4];
    int i;

    printf("Enter some text\n");
    scanf("%c %c %c %c", &string[0], &string[1], &string[2], &string[3]);

    printf("You Entered ");

    for (i = 0; i < 4; i++){
        printf("%c", string[i]);
    }

    return 0;
}

This compiles just fine on the Mac command line (assuming the source is in "test.c")

$ cc -g -Wall -o test test.c 
./test
Enter some text
a b c d
You Entered abcd

Also note that this particular snippet requires only stdio.h (man scanf and man printf will tell you which header to use).

edited Feb 20, 2014 at 20:24

answered Feb 20, 2014 at 19:56

stvsmth

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Comments

Yuva Raj · Accepted Answer · 2014-02-20 20:00:40Z

0

How about executing this code?

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{ 
    char strin[10];

    printf("Enter some text\n");
    scanf("%s", strin);

    printf("You Entered %s",strin);

    return 0;
}

The following code gives you :

Enter some text
abcd
You Entered abcd

enter image description here

answered Feb 20, 2014 at 20:00

Yuva Raj

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