Task: Kronecker product
C: #include<stdlib.h>
#include<stdio.h>

int main(){
	
	char input[100],output[100];
	int i,j,k,l,rowA,colA,rowB,colB,rowC,colC,startRow,startCol;
	double **matrixA,**matrixB,**matrixC;
	
	printf("Enter full path of input file : ");
	fscanf(stdin,"%s",input);
	
	printf("Enter full path of output file : ");
	fscanf(stdin,"%s",output);
	
	FILE* inputFile = fopen(input,"r");
	
	fscanf(inputFile,"%d%d",&rowA,&colA);
	
	matrixA = (double**)malloc(rowA * sizeof(double*));
	
	for(i=0;i<rowA;i++){
		matrixA[i] = (double*)malloc(colA*sizeof(double));
		for(j=0;j<colA;j++){
			fscanf(inputFile,"%lf",&matrixA[i][j]);
		}
	}
	
	fscanf(inputFile,"%d%d",&rowB,&colB);
	
	matrixB = (double**)malloc(rowB * sizeof(double*));
	
	for(i=0;i<rowB;i++){
		matrixB[i] = (double*)malloc(colB*sizeof(double));
		for(j=0;j<colB;j++){
			fscanf(inputFile,"%lf",&matrixB[i][j]);
		}
	}
	
	fclose(inputFile);
	
	rowC = rowA*rowB;
	colC = colA*colB;
	
	matrixC = (double**)malloc(rowC*sizeof(double*));
	
	for(i=0;i<rowA*rowB;i++){
		matrixC[i] = (double*)malloc(colA*colB*sizeof(double));
	}
	
	for(i=0;i<rowA;i++){
		for(j=0;j<colA;j++){
			startRow = i*rowB;
			startCol = j*colB;
			for(k=0;k<rowB;k++){
				for(l=0;l<colB;l++){
					matrixC[startRow+k][startCol+l] = matrixA[i][j]*matrixB[k][l];
				}
			}
		}
	}

	FILE* outputFile = fopen(output,"w");
	
	for(i=0;i<rowC;i++){
		for(j=0;j<colC;j++){
			fprintf(outputFile,"%lf\t",matrixC[i][j]);
		}
		fprintf(outputFile,"\n");
	}
	
	fclose(outputFile);
	
	printf("\n\n\nKronecker product of the two matrices written to %s.",output);
}

VB: 
dim a(),b(),r()
 
sub kroneckerproduct 
    m=ubound(a,1): n=ubound(a,2)
    p=ubound(b,1): q=ubound(b,2)
    rtn=m*p
    ctn=n*q
    redim r(rtn,ctn) 
    for i=1 to m
        for j=1 to n
            for k=1 to p
                for l=1 to q
                    r(p*(i-1)+k,q*(j-1)+l)=a(i,j)*b(k,l)  
    next: next: next: next
end sub 
 
sub printmatrix(text,m,w)
    wscript.stdout.writeline text
    select case m
        case "a": ni=ubound(a,1): nj=ubound(a,2)
        case "b": ni=ubound(b,1): nj=ubound(b,2)
        case "r": ni=ubound(r,1): nj=ubound(r,2)
    end select
    for i=1 to ni
        for j=1 to nj
            select case m
                case "a": k=a(i,j)
                case "b": k=b(i,j)
                case "r": k=r(i,j)
            end select
            wscript.stdout.write right(space(w)&k,w)
        next
        wscript.stdout.writeline
    next
end sub 
 
sub printall(w)
    printmatrix "matrix a:", "a", w 
    printmatrix "matrix b:", "b", w 
    printmatrix "kronecker product:", "r", w  
end sub 
 
sub main()
    xa=array( 1, 2, _
              3, 4)
    redim a(2,2)
    k=0: for i=1 to ubound(a,1): for j=1 to ubound(a,1)
        a(i,j)=xa(k): k=k+1
    next:next
    xb=array( 0, 5, _ 
              6, 7)
    redim b(2,2)
    k=0: for i=1 to ubound(b,1): for j=1 to ubound(b,1)
        b(i,j)=xb(k): k=k+1
    next:next
    kroneckerproduct
    printall 3
 
    xa=array( 0, 1, 0, _ 
              1, 1, 1, _ 
              0, 1, 0)
    redim a(3,3)
    k=0: for i=1 to ubound(a,1): for j=1 to ubound(a,1)
        a(i,j)=xa(k): k=k+1
    next:next
    xb=array( 1, 1, 1, 1, _ 
              1, 0, 0, 1, _ 
              1, 1, 1, 1) 
    redim b(3,4)
    k=0: for i=1 to ubound(b,1): for j=1 to ubound(b,1)
        b(i,j)=xb(k): k=k+1
    next:next
    kroneckerproduct
    printall 2
end sub 

main