我正在尝试编写一个计算每行中“ Hello”发生次数的程序
#include <stdio.h>
#include <string.h>
#define FALSE 0
#define TRUE 1
unsigned countWords(char *str)
{
int state = FALSE;
unsigned wc = 0;
while (*str)
{
if (*str == ' ' || *str == '\n' || *str == '\t')
state = FALSE;
else if (state == FALSE)
{
state = TRUE;
++wc;
}
++str;
}
return wc;
}
int main()
{
char a[1000];
int nwords = 0;
int count = 0;
while(fgets(a, sizeof(a), stdin))
{
nwords = countWords(a);
fseek(stdin,0,SEEK_SET);
for(int i = 0; i < nwords; i++)
for(;scanf("%s", a)!=EOF;)
if(!strcmp(a, "Hello")) count++;
printf("%d\n", count);
count = 0;
nwords = 0;
}
return 0;
}
对于这样的输入：
Hello Hello
is Hello here
no it is not here
输出应为：
2
1
0
but my output is just 3. Why does this happen when I set count = 0 after printf? I guess when it prints it is already 3. If I put printf inside a for loop it doesn't work either. Isn't while(fgets.....) supposed to read a line, do the stuff inside the loop until the end of line is reached and then go to another line and so on?
