C Language | Arrays 12

Question:3.
C program to Take input for the elements of a double dimension array of dimension R X C. Further display the elements in the form of a matrix. Also calculate and print sum of row elements ,get the following output:

1 2 3 6
4 5 6 15
7 8 9 24
Sol:

#include<stdio.h>

int main()
{
    int a[10][10],r,c,i,j,s=0;
    /* clrscr(); */
    printf("Enter total rows and cols ");
    scanf("%d %d",&r,&c);
    for(i=0;i<r;i++)
    {
        for(j=0;j<c;j++)
        {
            printf("Enter [%d][%d] element ",i,j);
            scanf("%d",&a[i][j]);
        }
    }
  for(i=0;i<r;i++)
  {
      s=0;
        for(j=0;j<c;j++)
        {
            printf("%4d",a[i][j]);
            s=s+a[i][j];
        }
        printf(" %4d\n",s);
    }
    return 0;
}

/* Output */

Enter total rows and cols 3
3
Enter [0][0] element 1
Enter [0][1] element 2
Enter [0][2] element 3
Enter [1][0] element 4
Enter [1][1] element 5
Enter [1][2] element 6
Enter [2][0] element 7
Enter [2][1] element 8
Enter [2][2] element 9
   1   2   3    6
   4   5   6   15
   7   8   9   24

Question:4.
C program to Take input for the elements of a double dimension array of dimension R X C. Further display the elements in the form of a matrix. Also calculate and print sum of row elements,get the following output:
1 2 3 6
4 5 6 21
7 8 9 45

Sol:

#include<stdio.h>

int main()
{
    int a[10][10],r,c,i,j,s=0;
    /* clrscr(); */
    printf("Enter total rows and cols ");
    scanf("%d %d",&r,&c);
    for(i=0;i<r;i++)
    {
        for(j=0;j<c;j++)
        {
            printf("Enter [%d][%d] element ",i,j);
            scanf("%d",&a[i][j]);
        }
    }
  for(i=0;i<r;i++)
  {
        for(j=0;j<c;j++)
        {
            printf("%4d",a[i][j]);
            s=s+a[i][j];
        }
        printf(" %4d\n",s);
    }
    return 0;
}

/* Output */

Enter total rows and cols 3
3
Enter [0][0] element 1
Enter [0][1] element 2
Enter [0][2] element 3
Enter [1][0] element 4
Enter [1][1] element 5
Enter [1][2] element 6
Enter [2][0] element 7
Enter [2][1] element 8
Enter [2][2] element 9
   1   2   3    6
   4   5   6   21
   7   8   9   45

Question:5.
C program to Take input for the elements of a double dimension array of dimension R X C. Further display the elements in the form of a matrix. Also calculate and print sum of right diagonal elements
1 2 3
4 5 6
7 8 9
Sum : 15 ( ie Sum of (1+5+9))

Note: condition: Matrix should be a square matrix (i.e. the number of rows and cols should be same)

Sol:

/* Sum of right diagonal elements */
#include<stdio.h>
#include<stdlib.h> //exit()

int main()
{
    int a[10][10],r,c,i,j,s=0;
    /* clrscr(); */
    printf("Enter total rows and cols ");
    scanf("%d %d",&r,&c);
    if(r==c)
        printf("Sum of diagonal elements can be calculated\n");
    else
    {
        printf("Sum of diagonal elements cannot be calculated\n");
        getch();
        exit(1);
    }
    for(i=0;i<r;i++)
    {
        for(j=0;j<c;j++)
        {
            printf("Enter [%d][%d] element ",i,j);
            scanf("%d",&a[i][j]);
        }
    }
    for(i=0;i<r;i++)
    {
            for(j=0;j<c;j++)
            {
                printf("%4d",a[i][j]);
                if(i==j)
                    s=s+a[i][j];

            }
            printf("\n");
    }
    printf("Sum of right diagonal elements = %d\n",s);

    return 0;
}

/* Output */

Case:1

Enter total rows and cols 2
3
Sum of diagonal elements cannot be calculated

Case:2

Enter total rows and cols 3
3
Sum of diagonal elements can be calculated
Enter [0][0] element 1
Enter [0][1] element 2
Enter [0][2] element 3
Enter [1][0] element 4
Enter [1][1] element 5
Enter [1][2] element 6
Enter [2][0] element 7
Enter [2][1] element 8
Enter [2][2] element 9
   1   2   3
   4   5   6
   7   8   9
Sum of right diagonal elements = 15