C-Program to print sum of Columns in matrix using GOTO Statement

#include<stdio.h>

int main()

{

 int i,j,rows,col,sum_rows,sum_col,k=0;

 printf("Enter number of rows and columns of a matrix\n");

 scanf("%d %d",&rows,&col);

int a[rows][col];

  //Taking input of matrix

    printf("Enter Matrix 1\n");

    for(i=0;i<rows;i++)

    {

       for(j=0;j<col;j++)

      {

     scanf("%d",&a[i][j]);

      }

    }

   

    printf("Given /matrix is\n");

        for(i=0;i<rows;i++)

         {

         for(j=0;j<col;j++)

         {

           printf("%d\t",a[i][j]);

           }

 

           printf("\n");

           }

  k=0;

  i=0;

   FirstLoop:

   {

        if(i<col)

      {

          sum_col=0;

          j=0;

          SecondLoop:

          {

           if(j<rows)

           {

            sum_col+=a[j][i];

            j++;

            goto SecondLoop;

            }

          }

            printf("Sum of %d Column is %d\n",k,sum_col);

            k++;

            i++;

            goto FirstLoop;

         }

  }   

return 0;

}

C-Program to Check whether given Matrix is Orthogonal or not

#include<stdio.h>

int main()

{

 int i,j,k,size,flag=1;

 printf("Enter size of square matrix i.e 3 for 3x3 and 4 for 4x4 etc\n");

 scanf("%d",&size);

 int a[size][size],temp[size][size],identityCheck[size][size],sum=0;

 printf("Enter Elements in matrix\n");

 for(i=0;i<size;i++)

 {

  for(j=0;j<size;j++)

  {

   scanf("%d",&a[i][j]);

  }

 }

 //Transpose of given matrix

 for(i=0;i<size;i++)

 {

  for(j=0;j<size;j++)

  {

   temp[i][j]=a[j][i];

  }

 }

 //Multiplying given A with A^T

 for(i=0;i<size;i++)

 {

  for(j=0;j<size;j++)

  {

   for(k=0;k<size;k++)

   {

    sum+=(a[i][k]*temp[k][j]);

   }

   identityCheck[i][j]=sum;

   sum=0;

  }

 }

 //Checking whether A*A^T resulted in Identity Matrix or not

 for(i=0;i<size;i++)

 {

  for(j=0;j<size;j++)

  {

   if(i==j && identityCheck[i][j]!=1)

   flag=0;

   if(i!=j && identityCheck[i][j]!=0)

   flag=0;

  }

 }

 //Checking for Orthogonal Matrix or not

 if(flag==1)

 {

  printf("Given Matrix is Orthogonal Matrix\n");

 }

 else

 {

  printf("Given Matrix is not an Orthogonal Matrix\n");

 }

return 0;

}