文本文件中的“a”号 [英] No. of 'a' in a text file
问题描述
/ *我编写了以下程序来计算否。文件中的''a''
c：/1.txt但它未能给出适当的结果。有什么问题
呢？ * /
#include" stdio.h"
int main（无效）
{
FILE * f;
char ch;
long int a = 0;
f = fopen（" c：/1.txt" ，r）;
while（ch = getc（f）！= EOF）
{
switch（ch）
{
case''a''：a ++; break;
}
}
printf（"''a''=％d \ n"，a）;
fclose（f）;
返回0;
}
/* I wrote the following program to calculate no. of ''a'' in the file
c:/1.txt but it fails to give appropriate result. What is wrong with
it? */
#include"stdio.h"
int main(void)
{
FILE *f;
char ch;
long int a=0;
f=fopen("c:/1.txt","r");
while(ch=getc(f)!=EOF)
{
switch(ch)
{
case ''a'': a++;break;
}
}
printf("No. of ''a'' = %d\n",a);
fclose(f);
return 0;
}
推荐答案
ume
h说：
h said:
/ *我编写了以下程序来计算否。文件中的''a''
c：/1.txt但它未能给出适当的结果。有什么问题
呢？ * /
#include" stdio.h"
int main（无效）
{
FILE * f;
char ch;
long int a = 0;
f = fopen（" c：/1.txt" ，" R"）;
/* I wrote the following program to calculate no. of ''a'' in the file
c:/1.txt but it fails to give appropriate result. What is wrong with
it? */
#include"stdio.h"
int main(void)
{
FILE *f;
char ch;
long int a=0;
f=fopen("c:/1.txt","r");
如果fopen失败会怎么样？
What happens if the fopen fails?
while（ch = getc（f）！= EOF ）
while(ch=getc(f)!=EOF)
你确定要说这个吗？考虑=和！=
的优先级并检查getc的返回类型。
Are you sure you meant to say this? Consider the precedences of = and !=
and check the return type of getc.
{
switch （ch）
{
case''a''：a ++; break;
{
switch(ch)
{
case ''a'': a++;break;
你真的打算在这一点上突破你的循环吗？
Do you really mean to break out of your loop at this point?
}
}
printf（"'a''=％d \ n'，'）的编号;
}
}
printf("No. of ''a'' = %d\n",a);
您是否阅读过printf的文档？
-
Richard Heathfield
Usenet是一个奇怪的地方 - dmr 29/7/1999
http://www.cpax.org.uk
电子邮件：rjh在上述域名中， - www。
Did you read the documentation for printf?
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: rjh at the above domain, - www.
ume
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