Thread: 2 dimensional arrays

  1. #1
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    2 dimensional arrays

    Good day everyone. I am a newbie in C, just started out like 4 days ago. I am currently doing 2 dimensional arrays and came across this example. But when i ran it in the compiler, it says the for loop is only allowed in C99 mode. and im notsure if there are other errors. Help would be appreciated .Tq.

    Code:
    #include <stdio.h>
    int main()
    {
        int temperature[CITY][WEEK];
        for(int i =0; i < CITY;++i){
            for(int j =0; j < WEEK;++j){
                printf("City %d, Day %d: ", i+1, j+1);
                scanf("%d",&temperature[i][j]);
            }
        }
    
        printf("\nDisplaying values: \n\n");
        for(int i =0; i < CITY;++i){
            for(int j =0; j < WEEK;++j)
            {
                printf("City %d, Day %d = %d\n", i+1, j+1, temperature[i][j]);
            }
        }
        return0;
    }

  2. #2
    and the hat of int overfl Salem's Avatar
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    Well if your compiler is GCC for example, then try
    gcc -std=c99 prog.c

    If your compiler is Microsoft visual studio, then know that it only supports C89.
    In which case, you have to turn
    for(int i =0; i < CITY;++i)
    into
    int i;
    for(i =0; i < CITY;++i)
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  3. #3
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    I am doing the C programming momentarily in tutorialspoint online compiler

  4. #4
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    project -> compile options

    Add the -std=c99 flag as shown by Salem.

  5. #5
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    On line 4 it looks like you tried to declare a variable length 2D array. (PS, matrice is another term used for 2D arrays). You put in variables city and week but they have not been defined properly. That's the first thing I've noticed.


    ALso at the top write a discription about what your code is designed to do.
    I do like how you put some commentary in your printf() functions.

    -Jovani Sanchez, New to C as well.
    Last edited by Jovani Sanchez; 01-24-2017 at 07:29 PM.

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