pex2_2.cpp

来自「数据结构C++代码,经典代码,受益多多,希望大家多多支持」· C++ 代码 · 共 54 行

#include <iostream.h>
#include <iomanip.h>
#include <stdlib.h>

void OctIn(unsigned int& n)
{
	int base8Value = 0;
	char ch;
	
	// skip white space
	do
	{
		ch = cin.get();
	}
	while (ch == ' ' || ch == '\t' || ch == '\n');   // whitespace
	
	// char should be in range '0'..'7'
	if (ch < '0' || ch >= '8')
	{
		cerr << "Invalid octal input";
		exit(1);
	}
		
	// convert as long as have octal digit
	while (ch >= '0' && ch < '8')
	{
		base8Value *= 8;
		base8Value += ch - '0';
		ch = cin.get();
	} 
	n = base8Value;
}

void main (void)
{
	unsigned int value;
	
	for (int i = 0; i < 5; i++)
	{
		OctIn(value);
		cout << value << endl;
	}
}

/*
<Run>

7  177  127  7776  177777
7
127
87
4094
65535
*/