//WAP to get sum of diagonal elements of an array of order 'mxn'.

//WAP to get sum of diagonal elements of an array of order 'mxn'.
#include<stdio.h>
#include<conio.h>
void main()
{
int matrics_1[100][100];
int i,j,sum=0;
int total_row,total_col;
printf("for sum, the matrix must be square\n");
printf("enter total number of rows(m)\n");
scanf("%d",&total_row);                     // for total number of rows of matrix
printf("enter total columns(n)\n");;
scanf("%d",&total_col);                     // for total number of columns of matrix
printf("enter elements of matrix\n");
for(i=0;i<total_row;i++)
{
  for(j=0;j<total_col;j++)                  // nested loop for input of elements
       {
           scanf("%d",&matrics_1[i][j]);   // getting inputs from user
        }
}
printf("the matrix is\n");             // message display
for(i=0;i<total_row;i++)
{
  for(j=0;j<total_col;j++)             
       {
           printf("%d",matrics_1[i][j]); // display of matrix
        }
        printf("\n");                    // display in next row
}
printf("------------------\n");             // for transposed matrix
for(i=0;i<total_row;i++)
{
  for(j=0;j<total_col;j++)
       {
           if(i==j)                          // testing whether the locations are same or not
           {
           sum=sum+matrics_1[i][j];
            }                                // display of matrix with trasnposed elemnts
       }
       printf("\n");
}

printf("sum=%d",sum);
     
getch();
}

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using codeblocks.
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//WAP to get sum of diagonal elements of an array of order 'mxn'.
#include<stdio.h>
int main()
{
int matrics_1[100][100];
int i,j,sum=0;
int total_row,total_col;
printf("for sum, the matrix must be square\n");
printf("enter total number of rows(m)\n");
scanf("%d",&total_row);                     // for total number of rows of matrix
printf("enter total columns(n)\n");;
scanf("%d",&total_col);                     // for total number of columns of matrix
printf("enter elements of matrix\n");
for(i=0;i<total_row;i++)
{
  for(j=0;j<total_col;j++)                  // nested loop for input of elements
       {
           scanf("%d",&matrics_1[i][j]);   // getting inputs from user
        }
}
printf("the matrix is\n");             // message display
for(i=0;i<total_row;i++)
{
  for(j=0;j<total_col;j++)             
       {
           printf("%d",matrics_1[i][j]); // display of matrix
        }
        printf("\n");                    // display in next row
}
printf("------------------\n");             // for transposed matrix
for(i=0;i<total_row;i++)
{
  for(j=0;j<total_col;j++)
       {
           if(i==j)                          // testing whether the locations are same or not
           {
           sum=sum+matrics_1[i][j];
            }                                // display of matrix with trasnposed elemnts
       }
       printf("\n");
}

printf("sum=%d",sum);
 return 0;       
}