LabnoTech

/*
Title: Represent matrix using two dimensional arrays and perform following operations:
1) Addition using pointers
2) multiplication without pointers
3) transpose using pointers
*/

#include<stdio.h>
#include<stdlib.h>

void read(int a[10][10],int r,int c)
{
int i,j;
printf("\nenter row[%d]: ",r);
for(i=0;i<r;i++)
for(j=0;j<c;j++)
scanf("%d",&a[i][j]);
}

void disp(int a[10][10],int r,int c)
{
int i,j;
for(i=0;i<r;i++)
{
printf("\n");
for(j=0;j<c;j++)
{
printf(" %d",a[i][j]);
}
}
}

void mul(int a[10][10],int b[10][10],int c[10][10],int r1,int rc,int c2)
{
int i,j,k;
for(i=0;i<r1;i++)
{
for(j=0;j<c2;j++)
{
c[i][j]=0;
for(k=0;k<rc;k++)
c[i][j]+=a[i][k]*b[k][j];
}
         }
}


int **accept(int r,int c)//using pointers
{
int **p,i,j;

p= (int **)malloc(r*sizeof(int *));

for(i=0;i<r;i++)
*(p+i)= (int *)malloc(c*sizeof(int ));

for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
scanf("%d",*(p+i)+j);
}
}
return p;
}

void display(int **p,int r,int c)// using pointers
{
int i,j;
for(i=0;i<r;i++)
{
printf("\n");
for(j=0;j<c;j++)
{
printf("\t%d",*(*(p+i)+j));
}
}
}

int **add(int **p1,int **p2,int r,int c) //using pointers
{
int i,j,**p3;
p3= (int **)malloc(r*sizeof(int *));

for(i=0;i<r;i++)
*(p3+i)= (int *)malloc(c*sizeof(int ));

for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
*(*(p3+i)+j)=*(*(p1+i)+j) + *(*(p2+i)+j);
}
}
return p3;
}

int **transpose(int **p,int r,int c)//using pointers
{
int i,j,**p3;
p3= (int **)malloc(r*sizeof(int *));

for(i=0;i<r;i++)
*(p3+i)= (int *)malloc(c*sizeof(int ));

for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
*(*(p3+i)+j)=*(*(p+j)+i);
}
}
return p3;
}



int main()
{
int ch,**p1,**p2,**p3,r1=0,c1=0,r2=0,c2=0;
int a[10][10],b[10][10],c[10][10];
do
{
system("clear");
printf("\n\n********MENU***********");
printf("\n1.Addition(with pointer)\n2.Transpose(with pointer)\n3.Multiplication(without pointer)\n4.Exit\nEnter ur choice: ");
scanf("%d",&ch);
switch(ch)
{
case 1:
printf("\nEnter rows & cols of matrix P1: ");
scanf("%d%d",&r1,&c1);
printf("\nEnter matrix P1:");
p1=accept(r1,c1);
printf("\nEnter rows & cols of matrix P2: ");
scanf("%d%d",&r2,&c2);
printf("\nEnter matrix P1:");
p2=accept(r2,c2);
system("clear");
printf("\nMatrix P1: ");
display(p1,r1,c1);
printf("\n\nMatrix P2: ");
display(p2,r2,c2);

if(r1==r2 && c1==c2)
{
p3=add(p1,p2,r1,c1);
printf("\nAddition(P1+P2): ");
display(p3,r1,c1);
}
else
printf("\naddition not possible");
getchar();
break;
case 2:
printf("\nEnter rows & cols of matrix P1: ");
scanf("%d%d",&r1,&c1);
printf("\nEnter matrix P1:");
p1=accept(r1,c1);
system("clear");
printf("\nBefore Transpose: ");
display(p1,r1,c1);

if(r1==c1)
{
p2=transpose(p1,r1,c1);
printf("\n\nAfter Transpose: ");
display(p2,r1,c1);
}
else
printf("\nTranspose not possible");
getchar();
break;
case 3:
printf("\nEnter rows & cols of matrix P1: ");
scanf("%d%d",&r1,&c1);
printf("\nEnter matrix P1:");
read(a,r1,c1);
printf("\nEnter rows & cols of matrix P2: ");
scanf("%d%d",&r2,&c2);
printf("\nEnter matrix P1:");
read(b,r2,c2);
system("clear");
printf("\nMatrix P1: \n");
disp(a,r1,c1);
printf("\n\nMatrix P2: \n");
disp(b,r2,c2);
if(c1==r2)
{
mul(a,b,c,r1,c1,c2);
printf("\n\nMUL= ");
disp(c,r1,c2);
}
else
printf("\nMultiplication not possible");
getchar();
break;
case 4:
exit(0);
}
getchar();
}while(ch!=5);
return 0;
}