keywordsstatic.cpp

软件课程设计（1） 是一些非常经典的程序

#include <iostream>
using namespace std;
#include <fstream>
#include <string>


bool isLetter(char c)
{
  if(c>='a'&&c<='z'||c>='A'&&c<='Z') return true;
  else return false;
}

int Search(char a[9][10],const char *b,int n) 
{
   int left=0;int right=n-1;int mid=0;
   while(left<=right)
   {
      mid=(left+right)/2;
	  if(strcmp(a[mid],b)==0) return mid;
	  else if(strcmp(a[mid],b)<0) left=mid+1;
	  else right=mid-1;
   }
   return -1;
}

//源文件没有注释
                                                           
int main()
{
	int count[9]={0};  //存放关键字出现的次数
	char A[9][10]={"break","char","default","else","for","int","return","switch","while"};
	char filename[30];
	//输入的时候一定要是...:/.../...格式
	cout<<"请输入源程序代码.cpp 文件的绝对路径："<<endl;  
	cin>>filename;
	ifstream infile(filename,ios::in);
	if(!infile)
	{
		cerr<<"open error!"<<endl;
		abort();
	}
	char buffer[100];   //存放一行字符

	while(!infile.eof())                   
	{
	  infile.getline(buffer,100,'\n');
	  int len=strlen(buffer);
    for(int i=0;i<len;i++)
	  {
		if(isLetter(buffer[i]))  
		{
	      string str = "";
		  str +=buffer[i];
		  while(isLetter(buffer[++i]))
			 str +=buffer[i];
		     int r=Search(A,str.c_str(),9);
			 if(r!=-1) count[r]++;
		  }
	  }
	}

	infile.close();

	for(int j=0;j<9;j++)
		if(count[j])
		{
			cout.width(15);
            cout<<A[j]<<":     "<<count[j]<<endl;
		}
    
	return 0;
}