我正在编写一个函数,用于从给定的字符串中找到字符 :
Test.c文件如下:
#include<stdio.h>
int findIndex(char *array, char search)
{
int count=0;
char test;
int check = 0, repeat;
if(search == ',')
repeat = rand()%10;
else
repeat = rand()%11;
while((test = array[count]) != NULL)
{
if(test == search)
{
if(check == repeat)
return count;
check++;
}
count++;
}
}
int main()
{
char sc[] = "cn:Y,x509UniqueIdentifier:Y,pseudonym:Y,name:Y,l:Y,street:Y,state:Y,postalAddress:Y,postalCode:Y,telephoneNumber:Y,emailAddress:Y";
char testchar;
printf("Enter the search character: ");
testchar = getc(stdin);
printf("The search char found at: %d position.\n",findIndex(sc,testchar));
fflush(stdin);
while(testchar != 'N')
{
printf("The search char found at: %d posotion.\n",findIndex(sc,testchar));
printf("Enter the search character: ");
scanf("%c",&testchar);
fflush(stdin);
}
return 0;
}
预期的输出只是一次字符索引,但我得到了这个: -
[amarjeet@amarjeet ~]$ ./a.out
Enter the search character: Y
The search char found at: 66 position.
The search char found at: 128 position.
Enter the search character: The search char found at: 0 position.
Enter the search character:
我哪里出错了? 请让我知道问题是什么以及如何解决。
答案 0 :(得分:1)
您可能希望main函数看起来像这样:
int main()
{
char sc[] = "cn:Y,x509UniqueIdentifier:Y,pseudonym:Y,name:Y,l:Y,street:Y,state:Y,postalAddress:Y,postalCode:Y,telephoneNumber:Y,emailAddress:Y";
char testchar;
printf("Enter the search character: ");
scanf("%c",&testchar);
while(testchar != '\n' && getchar() != '\n'); # discard any next chars
while(testchar != 'N') {
printf("The search char found at: %d position.\n",findIndex(sc,testchar));
printf("Enter the search character: ");
scanf("%c",&testchar);
while(testchar != '\n' && getchar() != '\n'); # discard any next chars
}
return 0;
}
以上示例生成结果:
$ > ./a.out
Enter the search character: Y
The search char found at: 66 position.
Enter the search character: .
The search char found at: 0 position.
Enter the search character: ,
The search char found at: 83 position.
Enter the search character: g
The search char found at: 0 position.
Enter the search character: N
$ >
PS:输入流没有ISO定义fflush()。它在Microsoft的C运行时库中定义,但不可移植。
答案 1 :(得分:1)
您的代码中有一个必须更正的警告
EditText
以上行生成警告:指针与整数之间的比较。因此应更正为
while((test = array[count]) != NULL)
在你的输出中你得到两次字符索引,因为换行符也被拍摄并且它的位置也被打印(当你按下回车键时)。
为避免这种情况,你可以这样做
while((test = array[count])!='\0')
这就是你现在的程序。
注意:使用fflush(stdin)被认为是一种不好的做法并且具有未定义的行为。最好不要将它用于刷新输入流,因为它不可移植。请参阅更多信息Do not use fflush(stdin)
<强>输出
while(testchar != 'N')
{
if(testchar!='\n'){//checking whether character is newline
printf("The search char %d found at: %d posotion.\n",testchar,findIndex(sc,testchar));
printf("Enter the search character: ");
scanf("%c",&testchar);
}
else
{
scanf("%c",&testchar);//reading the newline character but not performing any operation(printing the index )
}
}
希望它有所帮助。快乐编码!!