Addition of each Column and row in C (using array)

#include <stdio.h>

int main()
{
    //matrix of 2X3
    int a[2][3], i, j, sum;
    printf("Enter the element of first row \n");
    for (i = 0; i < 2; i++)
    {
        for (j = 0; j < 3; j++)
        {
            if (i == 1)
            {
                printf("Enter the Elements of second row \n");
            }
            scanf("%d", &a[i][j]);
        }
    }

    printf("Elements are\n");
    for (i = 0; i < 2; i++)
    {
        for (j = 0; j < 3; j++)
        {
            printf("%d ", a[i][j]);
        }
        printf("\n");
    }

    // logic for addition of rows.
    for (i = 0; i < 1; i++)
    {
        for (j = 0, sum = 0; j < 3; j++)
        {
            sum = sum + a[i][j];
        }
    }
    printf("Adddition of First Row is: %d\n", sum);
    for (i = 1; i < 2; i++)
    {
        for (j = 0, sum = 0; j < 3; j++)
        {
            sum = sum + a[i][j];
        }
    }
    printf("Adddition of second Row is: %d\n", sum);

    // logic for addition of column.
    for (i = 0; i < 1; i++)
    {
        for (j = 0, sum = 0; j < 2; j++)
        {
            sum = sum + a[j][i];
        }
    }
    printf("Sum of first column is : %d\n", sum);
    // logic for addition of second column
    for (i = 1; i < 2; i++)
    {
        for (j = 0, sum = 0; j < 2; j++)
        {
            sum = sum + a[j][i];
        }
    }
    printf("Sum of second column is : %d\n", sum);
    // logic for addition of third column
    for (i = 2; i < 3; i++)
    {
        for (j = 0, sum = 0; j < 2; j++)
        {
            sum = sum + a[j][i];
        }
    }
    printf("Sum of third column is : %d\n", sum);
}

Here

int a[2][3], i, j, sum;

initialise the 2D array of variable name 'a' as 2 row and 3 column in the memory along with the variable i, j, sum.

for (i = 0; i < 2; i++)
    {
        for (j = 0; j < 3; j++)
        {
            if (i == 1)
            {
                printf("Enter the Elements of second row \n");
            }
            scanf("%d", &a[i][j]);
        }
    }

this block of code is used to take input in the 2D array.

 printf("Elements are\n");
    for (i = 0; i < 2; i++)
    {
        for (j = 0; j < 3; j++)
        {
            printf("%d ", a[i][j]);
        }
        printf("\n");
    }

the above block of code is used to print the input taken in the 2D array for conformation that all entered element is correctly placed as a matrix and we are good to go for further process of calculation.

// logic for addition of rows.
    for (i = 0; i < 1; i++)
    {
        for (j = 0, sum = 0; j < 3; j++)
        {
            sum = sum + a[i][j];
        }
    }
    printf("Adddition of First Row is: %d\n", sum);
    for (i = 1; i < 2; i++)
    {
        for (j = 0, sum = 0; j < 3; j++)
        {
            sum = sum + a[i][j];
        }
    }
    printf("Addition of second Row is: %d\n", sum);

the above code is the logic for addition of element of each row and hence printing the total sum after the execution of the the for loop.

// logic for addition of column.
    for (i = 0; i < 1; i++)
    {
        for (j = 0, sum = 0; j < 2; j++)
        {
            sum = sum + a[j][i];
        }
    }
    printf("Sum of first column is : %d\n", sum);
    // logic for addition of second column
    for (i = 1; i < 2; i++)
    {
        for (j = 0, sum = 0; j < 2; j++)
        {
            sum = sum + a[j][i];
        }
    }
    printf("Sum of second column is : %d\n", sum);
    // logic for addition of third column
    for (i = 2; i < 3; i++)
    {
        for (j = 0, sum = 0; j < 2; j++)
        {
            sum = sum + a[j][i];
        }
    }
    printf("Sum of third column is : %d\n", sum);
}

The above code prints the sum of each individual column of the matrix.