add.cpp

来自「做为SD0609的一员,我扎实的基础是如何打出来的,来看看我那时连猴子选大王都不」· C++ 代码 · 共 38 行

/*******************************************
* string to integer demo
* Tarena, Chen Zongquan, 2006/8
*******************************************/

#include <iostream>
using namespace std;

int str2int( char str[] );

int main(int argc, char* argv[])
{
	int sum=0;
	for( int i=1; i<argc; i++ )
	{
		sum += str2int( argv[i] );
	}
	cout << "sum is " << sum << endl;
	return 0;
}

int str2int( char str[] )
{
	bool isNumChar( char ch );
	int res=0;
	for( int i=0; isNumChar( str[i] ); i++ )
	{
		res = res * 10 + str[i] - '0';
	}
	return res;
}

bool isNumChar( char ch )
{
	return ch>='0'&&ch<='9';
}