我正在用c编写一个程序来搜索源代码文件并计算遇到的'C'保留字的数量。但只有输入的保留字是第一个字时才会打印保留字。并且它计算字符串的总数而不是使用的保留字的总数。有人可以帮我这个。我的代码太乱了，请不要介意。
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#define KEYMAX 32
FILE *fp ;
char data[1024];
struct keyword
{
char word[10];
int occur;
};
int i = 0, j = 0, pos;
char str[100], unit[20], ch;
int stored[1024];
char delimiters[] = " \t\n\v\f\r"; /* possible space delimiters */
char *token;
struct keyword key[32] = {"auto", 0, "break", 0, "case", 0,
"char", 0, "const", 0, "continue", 0,
"default", 0, "do", 0, "double", 0,
"else", 0, "enum", 0, "extern", 0,
"float", 0, "for", 0, "goto", 0,
"if", 0, "int", 0, "long", 0,
"register", 0, "return", 0, "short", 0,
"signed", 0, "sizeof", 0, "static", 0,
"struct", 0, "switch", 0, "typedef", 0,
"union", 0, "unsigned", 0, "void", 0,
"volatile", 0, "while", 0,};
int main()
{
takeinput();
system("CLS");
theresult();
// processresult();
// ctoken();
return (0);
}
int takeinput() // function to write in the file
{
printf( "**********Welcome*************" ) ;
fp = fopen("test.c", "w") ; // Open file in write mode.
if ( fp == NULL )
{
printf( "Could not open file test.c" ) ; // Prints the statement if the file is not able to open.
return 1;
}
printf( "\nPlease enter some text from keyboard to write in the file test.c \n\t" ) ;
// getting input from user
while ( strlen ( gets( data ) ) > 0 )
{
// writing in the file
fputs(data, fp) ; // Writes to file
fputs("\n", fp) ;
}
// closing the file
fclose(fp) ;
return 0;
}
int theresult()
{
fp = fopen("test.c", "r"); // read mode
if (fp == NULL)
{
perror("Error while opening the file.\n"); // Prints the statement if the file is not able to open.
return 1;
}
printf("The contents of test.c file are:\n");
// To covert the ch into str
int i= 0;
// printf("-----this is from ch----\n"); (Just for reference)
while((ch = fgetc(fp)) != EOF)
{
str[i]=ch;
i++;
// printf("%c",ch); prints character
}
printf("%s",str);
// printf("\n----This is from token-----\n"); (just for reference)
for (token = strtok(str, delimiters); token != NULL;
token = strtok(NULL, delimiters)) /* 'for loop' conditional part */
/* prints token one per line */
// puts(token); // prints token
for (i = 0; i < strlen(str); i++)
{
while (i < strlen(str) && str[i] != ' ' && isalpha(str[i]))
{
unit[j++] = tolower(str[i++]);
}
if (j != 0)
{
unit[j] = '\0';
pos = binarysearch(unit, key);
j = 0;
if (pos != -1)
{
key[pos].occur++;
}
}
}
printf("***********************\n Keyword\tCount\n***********************\n");
for (i = 0; i < KEYMAX; i++)
{
if (key[i].occur)
{
printf(" %s\t %d\n", key[i].word, key[i].occur); // Prints the reserved keyword and its occurance
}
}
fclose(fp);
return (0);
}
int binarysearch(char *word, struct keyword key[])
{
int low, high, mid;
low = 0;
high = KEYMAX - 1;
while (low <= high)
{
mid = (low + high) / 2;
if (strcmp(word, key[mid].word) < 0)
{
high = mid - 1;
}
else if (strcmp(word, key[mid].word) > 0)
{
low = mid + 1;
}
else
{
return mid;
}
}
return -1;
}
输入的字符串是：如果我中断请重新加入。浮漂
关键字计数
if 1
break 1
Float 2
错误在函数theresult中。在用于标记输入的for循环中，您处理并搜索整个输入str中的单词，而不是从token返回的单词strtok。在标记化之后，您不必检查空间（' '），因为空间是分隔符的一部分。
在将循环更改为：
for (token = strtok(str, delimiters); token != NULL;
token = strtok(NULL, delimiters)) /* 'for loop' conditional part */
/* prints token one per line */
// puts(token); // prints token
for (i = 0; i < strlen(token); i++)
{
while (i < strlen(token) && token[i] != ' ' && isalpha(token[i]))
{
unit[j++] = tolower(token[i++]);
}
if (j != 0)
{
unit[j] = '\0';
pos = binarysearch(unit, key);
j = 0;
if (pos != -1)
{
key[pos].occur++;
}
}
}
输出是
The contents of test.c file are:
if i break please re-join it. float float
***********************
Keyword Count
***********************
break 1
float 2
if 1
补充说明：
而不是将整个输入文件读入str我建议使用fgets和循环逐行读取和处理输入。
如果您希望用户输入输入文本，您可以直接处理输入行，而不是先将它们写入文件"test.c"然后再读取文件。
标记化后的while循环将切断第一个非alpha字符的所有内容。也许你实现了这个，因为它由于原始错误而无法正常工作。当令牌是"re-join"时，它将搜索"re"。您应该检查这是否是您想要的，并在必要时更改while循环。