帮忙把C++改成C语言程序！

Question

#include<iostream.h>
#include<fstream.h>
#include<string.h>
#include<ctype.h>
#include<stdlib.h>
#include<conio.h>
struct KeyWord{
char Keyword[20];
int count;
};

KeyWord KeywordTable[]=
{
{"else",0},{"switch",0},{"if",0},{"do",0},{"while",0},{"case",0}
};

int SeqSearch(KeyWord *tab,int n,char *word)
{
int i;
for(i=0;i<n;i++,tab++)
if(strcmp(word,tab->Keyword)==0)
return i;
return -1;
}

int Getword(ifstream &fin,char w[])
{
char c;
int i=0;
while(fin.get(c)&&!isalpha(c));
if(fin.eof())
return 0;
w[i++]=c;
while(fin.get(c)&&(isalpha(c)||isdigit(c)))
w[i++]=c;
w[i]='\0';
return 1;
}

void main(void)
{
const int MAXWORD=50;
const int NKEYWORDS=sizeof(KeywordTable)/sizeof(KeyWord);
int n;
char word[MAXWORD],c;
ifstream fin;
fin.open("prg2_5.cpp",ios::in | ios::nocreate);//prg2_5.cpp就是统计本文件
if(!fin)
{
cerr<<"Could not open file'prg2_5.cpp'"<<endl;
exit(1);
}
while(Getword(fin,word))
if((n=SeqSearch(KeywordTable,NKEYWORDS,word))!=-1)
KeywordTable[n].count++;
for(n=0;n<NKEYWORDS;n++)
if(KeywordTable[n].count>0)
{
cout<<KeywordTable[n].count;
cout<<" "<<KeywordTable[n].Keyword<<endl;
}
fin.close();
getch();
}

Answer 1

总结下，把C++改成C如下即可：
1）改头文件：把#include<c*>或者#include<*>改成#include<*.h>,比如，把#include<cmath>改成#include<math.h、把#include<iostream>改成#include<iostream.h>。如果有using namespace std;把它去掉。

2）该输入输出流:cout改为printf（"%*",x);cin改成scanf("%*",&x)，比如输入输出一个整数：
cin>>x;scanf("%d",&x);
cout<<x;printf("%d",x);
换行：cout<<endl;或者cout<<"\n"改成printf("\n");

注：如果是把C改成C++，反过来即可。

Answer 2

你自己检查下算法:

#include<string.h>
#include<ctype.h>
#include<stdlib.h>
#include<conio.h>
#include<stdio.h>

typedef struct KeyWord{
char Keyword[20];
int count;
}KeyWord;

KeyWord KeywordTable[]=
{
{"else",0},{"switch",0},{"if",0},{"do",0},{"while",0},{"case",0}
};

int SeqSearch(KeyWord *tab,int n,char *word)
{
int i;
for(i=0;i<n;i++,tab++)
if(strcmp(word,tab->Keyword)==0)
return i;
return -1;
}

int Getword(FILE *fp,char w[])
{
char c;
int i=0;
while((c=fgetc(fp)) &&!isalpha(c))
{
if(feof(fp))
{
return 0;
}
}

w[i++]=c;
while((c = fgetc(fp)) &&(isalpha(c)||isdigit(c)))
{
w[i++]=c;
}

w[i]='\0';

return 1;
}

#define MAXWORD 50
void main(void)
{
const int NKEYWORDS=sizeof(KeywordTable)/sizeof(KeyWord);
int n;
char word[MAXWORD];
FILE *fin;

fin = fopen(__FILE__,"r");//prg2_5.cpp就是??本文件
if(!fin)
{
printf("Could not open file'prg2_5.cpp'");
exit(1);
}

while(Getword(fin,word))
{
if((n=SeqSearch(KeywordTable,NKEYWORDS,word))!=-1)
KeywordTable[n].count++;
}

for(n=0;n<NKEYWORDS;n++)
{
if(KeywordTable[n].count>0)
{
printf("%d",KeywordTable[n].count);
printf(" %s",KeywordTable[n].Keyword);
}
}
fclose(fin);
getch();
}

Answer 3

cout 改为prinft