C Language | Arrays 13

Question:6.
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 left diagonal elements
1 2 3
4 5 6
7 8 9
Sum : 15 ( ie Sum of (3+5+7))

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

Sol:

/* sum of Left 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==r-1) //or i+j==c-1)
                    s=s+a[i][j];

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

    return 0;
}

/* Output */

case:1

Enter total rows and cols 3
6
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 2
Enter [0][1] element 6
Enter [0][2] element 9
Enter [1][0] element 3
Enter [1][1] element 6
Enter [1][2] element 5
Enter [2][0] element 8
Enter [2][1] element 5
Enter [2][2] element 2
   2   6   9
   3   6   5
   8   5   2
Sum of left diagonal elements = 23

Question:7.
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 and left diagonal elements
1 2 3
4 5 6
7 8 9
Sum right diagonal elements = 15 (1+5+9)
Sum left diagonal elements = 15 (3+5+7)

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

Sol:

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

int main()
{
    int a[10][10],r,c,i,j,s1=0,s2=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)
                    s1=s1+a[i][j];
                if(i+j==r-1) //or i+j==c-1)
                    s2=s2+a[i][j];
            }
            printf("\n");
    }
    printf("Sum of right diagonal elements = %d\n",s1);
    printf("Sum of left diagonal elements = %d\n",s2);

    return 0;
}

/* Output */

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
Sum of left diagonal elements = 15

Question:8.
C program to Take input for the elements of a double dimension array of dimension R X C. Print transpose of matrix?

Normal matrix

1 2 3
4 5 6
7 8 9

Transpose of matrix
1 4 7
2 5 8
3 6 9
Sol:

#include<stdio.h>

int main()
{
    int a[10][10],r,c,i,j;
    /* 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]);
        }
    }
    printf("\nNormal Matrix\n");
    for(i=0;i<r;i++)
    {
            for(j=0;j<c;j++)
            {
                printf("%4d",a[i][j]);
            }
            printf("\n");
    }
    printf("\nTranspose  Matrix\n");
    for(j=0;j<c;j++)
    {
            for(i=0;i<r;i++)
            {
                printf("%4d",a[i][j]);
            }
            printf("\n");
    }
    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

Normal Matrix
   1   2   3
   4   5   6
   7   8   9

Transpose  Matrix
   1   4   7
   2   5   8
   3   6   9