powers.cpp

来自「《C/C＋＋程序设计导论（第二版）》一书的程序源文件」· C++ 代码 · 共 30 行

// powers.cpp   A program to prepare and reference a 2-d array of integer powers
//  ASSUMPTIONS: the integers 0 through 9 are represented by powers 1 through 4

#include <iostream.h>

// A function to fill a 2-d table of 10 rows with powers 1 through 4
void FillTable (int tab[][5])
{
	int row, col, product, n;
	for (row=0; row<10; row++)
		for (col = 0; col<5; col++)
		{	product = 1;  		// each cell is the integer value times itself a `col'
			for (n=0; n<col; n++)   //  number of times
				product *= row;
			tab[row][col] = product;
		}
}

void main()
{	int table[10][5],	// table of integer powers
		intval, power;

	// requested integer value and power (from user)
	FillTable (table);
	cout << "Enter integer (0 to 9) and requested power (1 to 4): ";
	cin >> intval >> power;
	cout << intval << " raised to a power of " << power << "  is " << table[intval][power];
}