### Program 130:To Multiply 'N' Matrices

Program 130:

```#include<stdio.h>
main()
{
int i,j,k,rows_1,col_1,rows_2,col_2,sum=0,flag=1,x,count=0,flag2=1;
printf("Enter number of rows and columns of matrix 1\n");
scanf("%d %d",&rows_1,&col_1);
printf("Enter number of rows and columns of matrix 2\n");
scanf("%d %d",&rows_2,&col_2);
int a1[100][100],a2[100][100],mul[100][100];
//int a1[rows_1][col_1],a2[rows_2][col_2],mul[rows_1][col_2];

do{

if(col_1==rows_2)
{
count++;

if(count==1)
{
//Taking input for 1st matrix
printf("Enter Matrix 1\n");
for(i=0;i<rows_1;i++)
{
for(j=0;j<col_1;j++)
{
scanf("%d",&a1[i][j]);
}
}
}

//Taking input for 2nd matrix
printf("Enter Matrix 2\n");
for(i=0;i<rows_2;i++)
{
for(j=0;j<col_2;j++)
{
scanf("%d",&a2[i][j]);
}
}
//multiplication of matrix
for(i=0;i<rows_1;i++)
{
for(j=0;j<col_2;j++)
{
for(k=0;k<rows_2;k++)
{
sum+=a1[i][k]*a2[k][j];
}
mul[i][j]=sum;
sum=0;
}
}

printf("Multiplication of above matrices is\n");

for(i=0;i<rows_1;i++)
{
for(j=0;j<col_2;j++)
{
printf("%d\t",mul[i][j]);
}

printf("\n");
}
printf("Enter 1 to continue to multiply the above to another matrix else 0\n ");
scanf("%d",&x);
if(x==1)
{
flag=1;
//clearing 1st matrix
for(i=0;i<rows_1;i++)
{
for(j=0;j<col_1;j++)
{
a1[i][j]=0;
}
}
//clearing 2nd matrix
printf("Enter Matrix 2\n");
for(i=0;i<rows_2;i++)
{
for(j=0;j<col_2;j++)
{
a2[i][j]=0;
}
}
for(i=0;i<rows_1;i++)
{
for(j=0;j<col_2;j++)
{
a1[i][j]=mul[i][j];
mul[i][j]=0;
}
}
rows_1=rows_1;
col_1=col_2;
printf("Enter rows and column of 2nd matrix\n");
scanf("%d %d",&rows_2,&col_2);
if(col_1!=rows_2)
{
printf("Final matrix after multiplication is\n");
for(i=0;i<rows_1;i++)
{
for(j=0;j<col_2;j++)
{
printf("%d\t",a1[i][j]);
}

printf("\n");
}
flag2=0;
}
count++;

}
else
{
flag=0;
}

}
else
{
printf("Not possible with the given rows and columns\n");
flag=0;

}

}while(flag);
if(count>0&&flag2!=0)
{
printf("Final matrix after multiplication is\n");
for(i=0;i<rows_1;i++)
{
for(j=0;j<col_2;j++)
{
printf("%d\t",mul[i][j]);
}

printf("\n");
}
}

}```
Explanation:

//Coming Soon...

Output:

After 1st run

After 2nd run:

After 3rd run(When rows and columns are not equal after 1st time or next multiplication in middle):

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