scanf() 在 for 循环中被跳过 [英] scanf() gets skipped in for loop

问题描述

在 Windows 中，我使用了 flushall() 函数来刷新所有缓冲区，但这在 Linux 中不起作用，我的 scanf() 函数会跳过而不扫描:

In Windows i used flushall() function to flush all the buffers but this doesnt work in Linux, my scanf() function skips without scanning:

for(i=0;i<n;i++)
   {
    printf("\nEnter alphabet :");
    scanf("%c",&x);
    printf("\nEnter frequency :");
    scanf("%f",&probability);
  /* create a new tree and insert it in
     the priority linked list */
    p=(treenode*)malloc(sizeof(treenode));
    p->left=p->right=NULL;
    p->data=x;
    p->freq=(float)probability;
    head=insert(head,p);
  }

输出:

mayur@mayur-laptop:~$ ./a.out

Enter alphabet :a

Enter frequency :2

Enter alphabet :
Enter frequency :a

Enter alphabet :
Enter frequency :2

Enter alphabet :
Enter frequency :a

Enter alphabet :

推荐答案

scanf 开头加一个空格，fflush(stdin)scanf 只是为了清除标准输入缓冲区(默认是键盘)，像这样:

You should add a space on the beginning of the scanf, and fflush(stdin) before every scanf just to clear the standard input buffer (keyboard by default), like this:

for(i=0;i<n;i++){
    printf("\nEnter alphabet :");
    fflush(stdin);
    scanf(" %c",&x);
    printf("\nEnter frequency :");
    fflush(stdin);
    scanf(" %f",&probability);
  /* create a new tree and insert it in
     the priority linked list */
    p=(treenode*)malloc(sizeof(treenode));
    p->left=p->right=NULL;
    p->data=x;
    p->freq=(float)probability;
    head=insert(head,p);
  }

检查您是否有 char x 和 float 概率

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