checking what the user has inputed

[LAMER_CODER]

Hi, I am using Dev C++ on a windows computer.

In my code, the user enters the name of a city, and then according to what city it is, the program displays the coordinates of that city

I can't find a way of figuring out and checking which city the user has entered so the code can displays its appropriate latitude and longitude


Any ideas ???

[std10093]

I am going to answer your question. However I think this is not your problem.

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

int main(void)
{
    char city[15];
    
    printf("Input please\n");
    
    // Read up to the length of city (%15s)
    scanf("%15s", city);
    
    if(strcmp(city, "Athens") == 0)
    {
        printf("Γεία σου!\n");
    }
    else if(strcmp(city, "Munich") == 0)
    {
        printf("Hallo\n");
    }
    else if(strcmp(city, "Milan") == 0)
    {
        printf("Ciao\n");
    }
    else if(strcmp(city, "Sydney") == 0)
    {
        printf("Hello\n");
    }
    else
    {
        printf("Unknown city\n");
    }

    return 0;
}

For ref for strcmp click here.

[LAMER_CODER]

I did this and it worked perfectly, but is there another and shorter version for this....

[grumpy]

String comparison would be part of the solution. It is a fair bet that a user will not enter "London" when they are thinking of Chicago.

However, you would need to handle the fact that some names of cities have been reused in different countries, and even sometimes in multiple states within a country. For example, several states in the US have towns or cities named London. So your code would need to detect if there are multiple matches, and ask the user for clarification (for example, a country name or maybe a state).

[Malcolm McLean]

Yes, that approach breaks down as your city list gets bigger.

You need to declare a structure with members name, longitude, latitude. Then populate an array of them using malloc and read in from an external file, or automatically generated as an internal data file.
Then the simplest solution is to step through it from 0 to N-1, looking froma match with strcmp().

[LAMER_CODER]

ummm, i am a beginner at c so i didnt understand to declare a structure with members name, longitude, latitude. Then populate an array of them using malloc and read in from an external file, or automatically generated as an internal data file.

but for the multiple cities, there is a prompt that asks which city the user is asking for, it states the city, state and country for each similar possibility

but i still dont get how to populate an array of them using malloc ??????

[LAMER_CODER]

i just need a short, sweet version instead of the longish if statements

[std10093]

For structs see a simple example here.
You could use a switch statement, instead of an if-else statement, but again it will be long!

[grumpy]

i just need a short, sweet version instead of the longish if statements

In other words, you want someone else to do your homework for you.

[iMalc]

Use a table. I.e. you have an array or strings and other stuff. The code then just has a loop that checks for a match.