// Using variable-length arrays in C99
#include <stdio.h>
// function prototypes
void print1DArray( int size, int arr[ size ] );
void print2DArray( int row, int col, int arr[ row ][ col ] );
int main( void )
{
int arraySize; // size of 1-D array
int row1, col1, row2, col2; // number of rows and columns in 2-D arrays
printf( "%s", "Enter size of a one-dimensional array: " );
scanf( "%d", &arraySize );
printf( "%s", "Enter number of rows and columns in a 2-D array: " );
scanf( "%d %d", &row1, &col1 );
printf( "%s",
"Enter number of rows and columns in another 2-D array: " );
scanf( "%d %d", &row2, &col2 );
int array[ arraySize ]; // declare 1-D variable-length array
int array2D1[ row1 ][ col1 ]; // declare 2-D variable-length array
int array2D2[ row2 ][ col2 ]; // declare 2-D variable-length array
// test sizeof operator on VLA
printf( "\nsizeof(array) yields array size of %d bytes\n",
sizeof( array ) );
// assign elements of 1-D VLA
for ( int i = 0; i < arraySize; ++i ) {
array[ i ] = i * i;
} // end for
// assign elements of first 2-D VLA
for ( int i = 0; i < row1; ++i ) {
for ( int j = 0; j < col1; ++j ) {
array2D1[ i ][ j ] = i + j;
} // end for
} // end for
// assign elements of second 2-D VLA
for ( int i = 0; i < row2; ++i ) {
for ( int j = 0; j < col2; ++j ) {
array2D2[ i ][ j ] = i + j;
} // end for
} // end for
puts( "\nOne-dimensional array:" );
print1DArray( arraySize, array ); // pass 1-D VLA to function
puts( "\nFirst two-dimensional array:" );
print2DArray( row1, col1, array2D1 ); // pass 2-D VLA to function
puts( "\nSecond two-dimensional array:" );
print2DArray( row2, col2, array2D2 ); // pass other 2-D VLA to function
} // end main
void print1DArray( int size, int array[ size ] )
{
// output contents of array
for ( int i = 0; i < size; i++ ) {
printf( "array[%d] = %d\n", i, array[ i ] );
} // end for
} // end function print1DArray
void print2DArray( int row, int col, int arr[ row ][ col ] )
{
// output contents of array
for ( int i = 0; i < row; ++i ) {
for ( int j = 0; j < col; ++j ) {
printf( "%5d", arr[ i ][ j ] );
} // end for
puts( "" );
} // end for
} // end function print2DArray
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