scalarMultiply

Author: ivanbrennan

prog.8.13.c

@@ -0,0 +1,50 @@
+#include <stdio.h>
+
+int main (void)
+{
+	void	scalarMultiply (int matrix[3][5], int scalar);
+	void	displayMatrix (int matrix[3][5]);
+	int		sampleMatrix[3][5] =
+			{
+				{  7, 16, 55, 13, 12 },
+				{ 12, 10, 52,  0,  7 },
+				{ -2,  1,  2,  4,  9 }
+			};
+
+	printf ("Original matrix:\n");
+	displayMatrix (sampleMatrix);
+
+	scalarMultiply (sampleMatrix, 2);
+
+	printf ("\nMultiplied by 2:\n");
+	displayMatrix (sampleMatrix);
+
+	scalarMultiply (sampleMatrix, -1);
+
+	printf ("\nThen multiplied by -1:\n");
+	displayMatrix (sampleMatrix);
+
+	return 0;
+}
+
+// Function to multiply a 3 x 5 array by a scalar
+
+void scalarMultiply (int matrix[3][5], int scalar)
+{
+	int row, column;
+
+	for ( row = 0; row < 3; ++row )
+		for ( column = 0; column < 5; ++column )
+			matrix[row][column] *= scalar;
+}
+
+void displayMatrix (int matrix[3][5])
+{
+	int row, column;
+
+	for ( row = 0; row < 3; ++row ) {
+		for ( column = 0; column < 5; ++column )
+			printf ("%5i", matrix[row][column]);
+		printf ("\n");
+	}
+}