Need to convert a string input from the user into different variables to use

Question

Here is a function for some code im working on in C. Right now it accepts 2 different user inputs and stores them as city and distance. What I want is for the user to input only once. For example "Enter the city name and distance from previous city: Arlington 200". I need to separate that string into values for city and distance. I think I need to use tokens but im not sure how.

void addCity ()
{
char city[30];
int distance;

printf("Enter city name : ");
scanf("%s",city);
printf("Enter distance from previous city: ");
scanf("%d",&distance);
printf("The city has been added.\n");

if(root == NULL){
root = (struct node *) malloc( sizeof(struct node) );
strcpy(root->city, city);
root->distance = distance;
root->next = NULL;
}
else
{

struct node *currentNode = root;
struct node *newNode = (struct node *) malloc( sizeof(struct node) );
while(currentNode->next!=NULL)
{
currentNode = currentNode->next;
}

strcpy(newNode->city, city);
newNode->distance = distance;

currentNode->next = newNode;
}
}

Indentation please. While it's irrelevant for the compiler, it does help humans to read and understand the code. — Some programmer dude, May 02 '19 at 21:06
Another couple of notes: In the `else` case, where do you initialize `newNode->next`? And [don't cast the result of `malloc` in C](https://stackoverflow.com/questions/605845/do-i-cast-the-result-of-malloc). — Some programmer dude, May 02 '19 at 21:08

dbush · Answer 1 · 2019-05-02T20:57:36.517

0

You can prompt for both at once:

printf("Enter the city name and distance from previous city: ");
scanf("%s %d",city, &distance);

edited May 02 '19 at 20:57

answered May 02 '19 at 20:56

dbush

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Will this method work with spaces? I"m about to try. – Adrian Guerra May 02 '19 at 20:59
I would make sure to limit that to 30 characters and check the return value, but good answer. – Neil May 02 '19 at 21:01
@AdrianGuerra Glad I could help. Feel free to [accept this answer](https://stackoverflow.com/help/accepted-answer) if you found it useful. – dbush May 03 '19 at 04:05
@AdrianGuerra The `"%s"` format reads space-delimited "words" anyway, so it's really no different at all from `scanf("%s",city); scanf("%d",&distance);` – Some programmer dude May 03 '19 at 05:23

Need to convert a string input from the user into different variables to use

1 Answers1