addition,multiplication and transpose of matrices

Code:

/*Progarm for addition,transpose and multiplication of array*/
#include<stdio.h>
#include<conio.h>
void main()
{
 int a,i,k,j,c1,c2,r1,r2;
 int m1[10][10],m2[10][10],m3[10][10];
 clrscr();
 while(1)
 {

 printf("\n 1. Transpose of Matrix:-\n");
 printf("\n 2. Addition of Matrix:-\n");
 printf("\n 3. Multiplication of Matrix:-\n");
 printf("\n 4. Exit\n");
 printf("\n Enter your choice:-");
 scanf("%d",&a);
 switch(a)
 {
 case 1 :
 printf("\n Enter the number of row and coloum:-");
 scanf("%d%d",&r1,&c1);
 printf("\n Enter the element :-");
 for(i=0;i<r1;i++)
 {
 for(j=0;j<c1;j++)
 {
 scanf("%d",&m1[i][j]);
 m2[j][i]=m1[i][j];
 }
 }
 /*Displaying transpose of matrix*/
 printf("\n Transpose of Matrix is:-\n");
 for(i=0;i<r1;i++)
 {
 for(j=0;j<c1;j++)
 printf("\t%d",m2[i][j]);
 printf("\n");
 }
 break;
  case 2:
 printf("\n how many row and coloum in Matrix one:-");
 scanf("%d%d",&r1,&c1);
 printf("\n How amny row and coloum in Matrix two:-");
 scanf("%d%d",&r2,&c2);
 if((r1==r2)&&(c1==c2))
 {
 printf("\n Addition is possible:-");
 printf("\n Input Matrix one:-");
 for(i=0;i<r1;i++)
 {
 for(j=0;j<c1;j++)
 scanf("%d",&m1[i][j]);
 }
 printf("\n Input Matrix two:-");
 for(i=0;i<r2;i++)
 {
 for(j=0;j<c2;j++)
 scanf("%d",&m2[i][j]);
 }
 /* Addition of Matrix*/
 for(i=0;i<r1;i++)
 {
 for(j=0;j<c1;j++)
 m3[i][j]=m1[i][j]+ m2[i][j];
 }
 printf("\n The sum is:-\n");
 for(i=0;i<c1;i++)
 {
 for(j=0;j<r1;j++)
 printf("%5d",m3[i][j]);
 printf("\n");
 }
 }
 else
 printf("\n Addition is not possible:-");

	break;
  case 3:

  printf("\n Enter number of row and coloum in matrix one:-");
  scanf("%d%d",&r1,&c1);
  printf("\n Enter number of row and coloum in matrix two:-");
  scanf("%d%d",&r2,&c2);
  if(c1==r2)
  {
  printf("\n Multiplication is possible:-");
  printf("\n Input value of Matrix one:-");
  for(i=0;i<r1;i++)
  {
  for(j=0;j<c1;j++)
  scanf("%d",&m1[i][j]);
  }
  printf("\n Input value of Matrix two:-");
  for(i=0;i<r2;i++)
  {
  for(j=0;j<c2;j++)
  scanf("%d",&m2[i][j]);
  }
  for(i=0;i<r1;i++)
  for(j=0;j<c2;j++)
  {
  m3[i][j]=0;
  for(k=0;k<c1;k++)
  m3[i][j]=m3[i][j]+m1[i][k]*m2[k][j];
  }
  /*Displaying final matrix*/
  printf("\n Multiplication of Matrix:-\n");
  for(i=0;i<r1;i++)
  {
  for(j=0;j<c2;j++)
  printf("\t%d",m3[i][j]);
  printf("\n");
  }
  }
  else
  printf("\n Multiplication is not possible");

break;
  case 4:
	exit(0);
}
getch();
}
}