CODEWITHSUNDEEP
carraysfunction
Mike
Mike

Reputation: 31

Printing Arrays in separate Function in C

I'm trying to print all of the values in the four arrays by sending them to a separate function. But, the problem is I can't get the function to print the all of the integers in the array because I'm not sure what I could set the condition statement in the for loop to, that would be universal to any array of any size.

Right now the function only prints the first 11 numbers. I assume that's because the first number in that array is 11.

    #include <stdio.h>

    void print_array(int a[]);

    void find_max(int b[]);

    void find_min(int c[]);

    void search(int d[]);

    void SORT(int e[]);

    int main(void)
    {
        int first[11] = {7,7,7,7,7,7,7,7,7,7,7};

        int second[14] = {11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, -1, -2};

        int third[16] = {-2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13};

        int fourth[23] = {-3, 4, 33, 22, 9, -100, 2, 56, 57, 55, 2, 90, 2234, 32, 8, 123, 2, 33, 22, 22, 33, -1, -3}; 


        print_array(&second[0]);


        return(0);
    }

    void print_array(int a[])
    {

        int i;
        for(i=0;i<*a;i++)
        {
            printf("%d ",a[i]);

        }
    }

Upvotes: 3

Views: 44046

Answers (6)

Deepak Kumar
Deepak Kumar

Reputation: 64

You need to modify ur print array

void print_array(int a[], int size) {
    int i;
    for(i = 0; i < size; i++) { // loop through each element in the array
        printf("%d ", a[i]); // print the value at the current index
    }
    printf("\n"); // add a newline at the end
}

Upvotes: 0

Moni Siva
Moni Siva

Reputation: 11

Change this line

print_array(&second[0]);

To

print_array(&second);

Because, &second[0] just passes the reference to the element at 0th position,which will not be able to traverse the array.

And we cannot traverse the array passed by reference without the size.As there are arrays of varied size, we can compute the size of the array by,

             int array_length = sizeof(array)/sizeof(array[0]);

Change the line 

void print_array(int a[])

To

void print_array(int *a,int array_length)

And the function of array printing will be as,

void print_array(int *a,int array_length){
    int i;
    for(i=0;i<array_length;i++){
        printf("%d ",*a);
        a++;          //for incrementing the position of array.
    }
}

Upvotes: 0

DU Jiaen
DU Jiaen

Reputation: 962

in C you can make it with a function and macro:

void printArray_(int *a, int len) {
    for (int i = 0; i < len; i++) printf("%d ", a[i]);
}

#define printArray(arr) printArray_((arr), sizeof(arr)/sizeof(arr[0]))

int main(int argc, _TCHAR* argv[])
{   
    int data[] = { 1,2,3,4 };
    printArray(data);
    return 0;
}

output:

1 2 3 4

Upvotes: 1

Wes Hardaker
Wes Hardaker

Reputation: 22252

Change the function to:

void print_array(int a[], size_t a_size) {
    int i;
    for(i=0; i< a_size;i++)
    // ...

And change the calling of the function to pass in the size:

    print_array(second, sizeof(second)/sizeof(second[0]));

Which will calculate the memory size of the array (for a 4 int array on a 32 bit system it'll be 16) and divide it by the size of an int (on a 32 bit system, it's 4 bytes).

Upvotes: 2

escargot agile
escargot agile

Reputation: 22379

The function has no way of knowing when the array ends. This piece of data simply does not exist unless you pass it manually. The array is just a sequence of bytes in the memory, it has no end delimiter. So you should add a parameter to the function telling it the length of the array.

Yep, this is how it works in C.

Upvotes: 3

MikeP
MikeP

Reputation: 7959

Pass a second argument to your function that takes the length of the array. For example:

print_array(int *array, int length)
{
    for (int i = 0; i < length; i++) { /* whatever */ }
}

Upvotes: 9

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