只打印長度超過10個字符的輸入行（ANSI C）

Question

因此，我正在編寫一個C語言練習程序，其目的是獲取用戶輸入，然後在到達EOF後，讀回輸入，但只讀取超過10個字符。

我在Linux上，所以EOF是Ctrl + D，但是，如果輸入行長度超過10，它會在我按下Enter時打印，而不是等到EOF達到。

這裏是我的代碼：

#define MAXSIZE 1000 
#define SIZE 10 

int checklen(char line[], int index); 

int main() 
{ 
    char currentline[MAXSIZE]; 
    int i = 0; 

     while ((currentline[i] = getchar()) != EOF){ 
      if (currentline[i] == '\n'){ 
       if (checklen(currentline, i) > SIZE){ 
        printf("%s", currentline); 
       } 
      } 
      ++i; 
     } 

    return 0; 
} 

int checklen(char line[], int index) 
{ 
    int i; 
     for (i=index; line[i] != '\n'; ++i){ 
      ; 
     } 
    return i; 
} 

編輯：我一直在努力，現在沒有運氣弄清楚了好一陣子。我不是很瞭解你們在說什麼，但是我們最終會到達那裏:)

我已經重寫了代碼，但它仍然無法正常工作。

#include <stdio.h> 

#define MAX 1000 
#define SIZE 10 

void examine(char input[], int index); 

int main() 
{ 
    int i=0; 
    char input[MAX]; 
    char output[MAX]; 

     //take user input and store it in our input string 
     while ((input[i] = getchar()) != EOF){ 
      ++i; 
     } 

     //put a null byte at the end of input[] 
     input[i+1] = '\0'; 

     //examine line by line until end of string (null byte) 
     for (i=0; input[i] != '\0'; ++i){ 
      if (input[i] == '\n'){ 
       examine(input, i); 
      } 
     } 

    return 0; 
} 

void examine(char input[], int index) 
{ 
    //decrement through input[] until \n or start [0] is reached 
    int i=0; 

     for (i=0; ((input[index] != '\n') || (index > 0)); ++i){ 
      --index; 
     } 
    //if line is bigger than 10 chars, print it 
    if (i>SIZE){ 
     for (; input[index+1] != '\n'; ++index){ 
      putchar(input[index]); 
     } 
    } 

    //otherwise, return 

    return; 
} 

Answer 1

#include <stdio.h> 

#define MAX 1000 
#define SIZE 10 

void examine(char input[], int index); 

int main(void){ 
    char input[MAX]; 
// char output[MAX]; 
    int i, ch; 

    for(i=0; i< MAX - 1 && (ch = getchar()) != EOF; ++i) 
     input[i] = ch; 

    input[i] = '\0'; 

    for (i=0; input[i] != '\0'; ++i){ 
     if (input[i] == '\n'){ 
      examine(input, i); 
     } 
    } 
    examine(input, i);//for '\0' 

    return 0; 
} 

void examine(char input[], int index){ 
    int i; 

    if(index == 0) return ; 

    for (i=1; index - i >= 0 && input[index-i] != '\n'; ++i) 
     ; 

    --i; 
    if (i > SIZE){ 
     while(i>0) 
      putchar(input[index - i--]); 
     putchar('\n'); 
    } 

    return; 
} 

---

緩衝區的大小11版本。

#include <stdio.h> 

#define SIZE 10 

void print(char ch){ 
    static char buf[SIZE+1]; 
    static index = 0, over = 0; 
    int i; 

    if(over){ 
     putchar(ch); 
     if(ch == '\n') 
      over = 0; 
     return ; 
    } 
    if(ch == '\n'){ 
     index = 0; 
    } else { 
     buf[index++] = ch; 
     if(index == SIZE + 1){ 
      for(i=0;i<index;++i){ 
       putchar(buf[i]); 
      } 
      index = 0; 
      over = 1; 
     } 
    } 
} 

int main(void){ 
    int ch; 

    while((ch = getchar()) != EOF){ 
     print(ch); 
    } 

    return 0; 
} 
//simple is to use the fgets 

Answer 2

重寫了它。其實很簡單。這裏是代碼：

/*this program takes keyboard input from the user until EOF 
and prints out their input excluding lines less than or equal to LINESIZE*/ 

#include <stdio.h> 

#define MAX 2000 
#define LINESIZE 10 

void checkprint(char line[]); 

int main() 
{ 
    char input[MAX]; 
    char line[MAX]; 
    int i, i2; 
    i2 = 0; 

     //take input until EOF (Ctrl + D) 
     for (i=0; (input[i]=getchar()) != EOF; ++i){ 
      ; 
     } 

    //add null byte to end of string  
    input[i+1] = '\0'; 
    //basic formatting for aesthetics 
    putchar('\n'); 


     //copy a line into line[] from input[] until NULL byte reached 
     for (i=0; input[i] != '\0'; ++i){ 
      line[i2] = input[i]; 
      ++i2; 
      //if end of line, call checkprint 
      if (input[i] == '\n'){ 
       checkprint(line); 
       i2=0; 
      } 
     } 

    return 0; 
} 

void checkprint(char line[]) 
{ 


    int i; 
     //find the length of the line 
     for (i=0; line[i] != '\n'; ++i){ 
      ; 
     } 

     //if longer than LINESIZE, print it 
    if (i > LINESIZE){ 
     putchar('\n'); 
     for (i=0; line[i] != '\n'; ++i){ 
      putchar(line[i]); 
     } 
    } 
}