modify the program so that the user is asked to type in the value of the base, if an invalid base number is entered the program will ask again until a correct value is entered.

#include

int main(void)

{

void scalarmultiply (int nrows, int ncols, int matrix[nrows][ncols], int scalar);

void displaymatrix (int nrows, int ncols, int matrix[nrows][ncols]);

int samplematrix[3][5] =

{

{7, 16, 55, 13, 12},

{12, 10, 52, 0, 7},

{-1, 1, 2, 4, 9}

};

printf("original matrix: ");

displaymatrix (3, 5, samplematrix);

scalarmultiply (3, 5, samplematrix, 2);

printf(" Multiplied by 2: ");

displaymatrix(3,5, samplematrix);

scalarmultiply (3,5, samplematrix, -1);

printf (" then multiplied by -1: ");

displaymatrix(3,5,samplematrix);

return 0;

}

void scalarmultiply (int nrows, int ncols, int matrix[nrows][ncols], int scalar)

{

int row, column;

for (row = 0; row < nrows; ++row)

for(column = 0; column < ncols; ++column)

matrix[row][column] *= scalar;

}

void displaymatrix ( int nrows, int ncols, int matrix[nrows][ncols])

{

int row, column;

for( row = 0; row < nrows; ++row)

{

for( column = 0; column < ncols; ++column)

printf("%5i", matrix[row][column]);

printf(" ");

}

}