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  1. #include<stdio.h>
  2. #include<string.h>
  3. #define SIZE 30
  4. struct stack
  5. {
  6.     int top;
  7.     char st[SIZE];
  8. }s;
  9. top=-1;
  10.  
  11. void push(char x)
  12. {
  13.     if(s.top==SIZE-1)printf("Stack is full");
  14.     else s.st[++s.top]=x;
  15. }
  16.  
  17. int pop()
  18. {
  19.     if(s.top==-1)
  20.     {
  21.         printf("Stack is empty");
  22.         return (int)'\0';
  23.     }
  24.     else
  25.     {
  26.         char x=s.st[s.top];
  27.         s.top--;
  28.         return (int)x;
  29.     }
  30. }
  31.  
  32. int main()
  33. {
  34.     int size,i=0;
  35.     printf("Enter size:");
  36.     scanf("%d",&size);
  37.     char string[size],x;
  38.     printf("Enter string:");
  39.     //scanf("%s",string);
  40.     /*for(i=0;string[i]!='\0';i++)
  41.     {
  42.    		scanf("%c",string[i]);
  43.     }*/
  44.     //gets(string);
  45.     /*while(x!='\0')
  46.     {
  47.     	x=getchar();
  48.     	string[i]=x;
  49.     	i++;
  50.     }*/
  51.     string[]={'a','b',' ','b','a'};
  52.     int l=strlen(string);i=0;
  53.     while(i<l)
  54.     {
  55.         push(string[i]);
  56.         i++;
  57.     }
  58.     i=0;
  59.     char string2[size];
  60.     while(i<l)
  61.     {
  62.         string2[i]=(char)pop();
  63.         i++;
  64.     }
  65.     printf("\nReversed text=%s",string2);
  66.     if(strcmp(string,string2)==0)printf("\nText is palindrome\n");
  67.     else printf("\nText is not palindrome\n");
  68.     return 0;
  69. }
Compilation error #stdin compilation error #stdout 0s 9432KB
comments (?)
stdin
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5
compilation info 
prog.c:9:1: warning: data definition has no type or storage class
 top=-1;
 ^~~
prog.c:9:1: warning: type defaults to ‘int’ in declaration of ‘top’ [-Wimplicit-int]
prog.c: In function ‘main’:
prog.c:51:12: error: expected expression before ‘]’ token
     string[]={'a','b',' ','b','a'};
            ^
prog.c:37:23: warning: unused variable ‘x’ [-Wunused-variable]
     char string[size],x;
                       ^
stdout
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Standard output is empty
https://ideone.com/sxWY8T
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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