program that store integer values into a 2D array

It starts counting from 6 because the line for (i = 0; i < 5; i++);, is iterating (incrementing) i 5 times so, i becomes 5, then you print i + 1 to stdout.

So, basically your call to printf() and scanf() functions were never a part of any sort of loop.

NOTE: Adding a semi-colon ;, after any loop means that there is no body for the loop. Basically it's an empty loop. It can be useful for finding the length of a string, and so on.

Some tips:

• Also instead to using bare return 0;, use return EXIT_SUCCESS;, which is defined in the header file stdlib.h.
• use int main(void) { }, instead of int main() { }
• always check whether scanf() input was successful or not

Correct Code

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

int main(void)
{
    int i;
    int array[3][5];

    for (i = 0; i < 5; i++)
    {
        printf("Input a whole number for row 1 element %d:\n", i + 1);
        if (scanf("%d", &array[0][i]) != 1)
        {
            perror("bad input: only numbers are acceptable\n");
            return EXIT_FAILURE;
        }
    }

    printf("Row 1 elements:\n");
    for (i = 0; i < 5; i++)
    {
        printf("%d\n", array[0][i]);
    }

    return EXIT_SUCCESS;
}

Output:

Input a whole number for row 1 element 1:
1
Input a whole number for row 1 element 2:
2
Input a whole number for row 1 element 3:
3
Input a whole number for row 1 element 4:
5
Input a whole number for row 1 element 5:
7
Row 1 elements:
1
2
3
5
7