默认启用忽略空字符 [英] null character(s) ignored enabled by default

问题描述

我正在尝试用数组实现堆栈！每次我执行程序时都运行良好，但我收到警告，因为默认启用忽略空字符

I am trying to implement stack with array! Every time i execute the program runs fine but i am getting warning as null character(s) ignored enabled by default

这个警告是什么意思?..我做错了什么?

What does this warning mean?.. what am i doing wrong?

我的代码是:

#include<stdio.h>
#include<stdlib.h>
# define MAX 10
int top=-1;
int arr[MAX];
void push(int item)
{
    if(top==MAX-1)
    {
        printf("OOps stack overflow:\n");
        exit(1);
    }
    top=top+1;
    arr[top]=item;
}//warning
int popStack()
{
    if(top==0)
    {
        printf("Stack already empty:\n");
        exit(1);
    }
    int x=arr[top];
    top=top-1;
    return x;
}
void display()
{
    int i;
    for(i=top;i>=0;i--)
    {
        printf("%d ",arr[i]);
    }
    return;
}
int peek()
{
    if(top==-1)
    {
        printf("\nEmpty stack");
        exit(1);
    }
    return arr[top];
}
int main()
{
     int i,value;
     printf(" \n1. Push to stack");
     printf(" \n2. Pop from Stack");
     printf(" \n3. Display data of Stack");
     printf(" \n4. Display Top");
     printf(" \n5. Quit\n");
     while(1)
     {
          printf(" \nChoose Option: ");
          scanf("%d",&i);
          switch(i)
          {
               case 1:
               {
               int value;
               printf("\nEnter a value to push into Stack: ");
               scanf("%d",&value);
               push(value);
               break;
               }
               case 2:
               {
                 int p=popStack();
                 printf("Element popped out is:%d\n",p);
                 break;
               }
               case 3:
               {
                 printf("The elements are:\n");
                 display();
                 break;
               }
               case 4:
               {
                 int p=peek();
                 printf("The top position is: %d\n",p);
                 break;
               } 
               case 5:
               {        
                 exit(0);
               }
               default:
               {
                printf("\nwrong choice for operation");
               }
         }
    }
    return 0;
}//warning

我使用的是 Dev C++ IDE.

I am using Dev C++ IDE.

推荐答案

在你的源代码文件的某处你有字节值为 0 的字符(ASCII NUL 字符).这在大多数文本编辑器中是不可见的.

Somewhere in your source code file you have character with the byte value 0 (the ASCII NUL character). Which will be invisible in most text editors.

编译器 (gcc) 只是告诉您它忽略了该字符 - 这实际上不应该出现在您的源代码中.

The compiler (gcc) is just telling you that it ignored that character - which really shouldn't be there in your source code .

您可以在十六进制编辑器中打开您的文件，找出该字符的位置并修复它，或者删除您的源文件并从您在此处发布的代码中复制粘贴回来.

You could open your file in a hex editor, figure out where that character is and fix it, or delete your source file and copy paste it back from the code you posted here.

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