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  1. #include<stdio.h>
  2. #include<string.h>
  3. #define size 100
  4. struct stack
  5. {
  6.     char items[size];
  7.     int top;
  8.  
  9. }s;
  10. char pop();
  11. void push(char);
  12. void display();
  13. int isfull();
  14. int isempty();
  15. int main()
  16. {
  17.     int i=1,c=0;
  18.     char ss[100],x;
  19.     printf("1.reverse line of text 2.palindrome check\n");
  20.     printf("enter any other key to quit\n");
  21.  
  22.  
  23.  
  24.   while(i!=0)
  25.    {
  26.        printf("enter choice ");
  27.        scanf("%d",&i);
  28.  
  29.      switch(i)
  30.      {
  31.          case 1:printf("\nenter string to reverse ");
  32.                 scanf("%[^\n]s",ss);
  33.                c=0;
  34.          for(i=0;i<strlen(ss);i++)
  35.          {
  36.              push(ss[i]);
  37.  
  38.          }
  39.          for(i=s.top;i>=0;i--)
  40.          {
  41.  
  42.              ss[c++]=s.items[i];
  43.              pop();
  44.          }
  45.          ss[c]='\0';
  46.          printf("\nreversed string is %s\n",ss);
  47.          break;
  48.          case 2: printf("enter string to be checked for palindrome\n");
  49.                  scanf("%[^\n]s",ss);
  50.                  if(strlen(ss)%2==0)c=strlen(ss)/2;
  51.                  else c=strlen(ss)/2+1;
  52.                  for(i=0;i<strlen(ss)/2;i++)
  53.                  {
  54.                      push(ss[i]);
  55.  
  56.                  }
  57.  
  58.                  for(i=c;i<strlen(ss);i++)
  59.                  {
  60.                      if(ss[i]==s.items[s.top])
  61.                      {
  62.  
  63.                          x=pop();
  64.  
  65.                  }
  66.                  else break;
  67.                  }
  68.  
  69.                  if(i==strlen(ss))printf("palindrome\n");
  70.                  else printf("not palindrome\n");
  71.                  break;
  72.               default:i=0;
  73.  
  74.      }
  75.    }
  76.  
  77. }
  78. int isfull()
  79. {
  80.  
  81.     return s.top==size-1;
  82. }
  83. int isempty()
  84. {
  85.  
  86.     return s.top==-1;
  87. }
  88. char pop()
  89. {
  90.     char x;
  91.     if(isempty())printf("cant pop as stack empty\n");
  92.     else
  93.     {
  94.         x=s.items[s.top];
  95.         s.top--;
  96.         return x;
  97.     }
  98.  
  99. }
  100. void push(char x)
  101. {
  102.     if(isfull())printf("cant push as stack full\n");
  103.     else
  104.     {
  105.         s.items[++s.top]=x;
  106.  
  107.  
  108.     }
  109.  
  110. }
  111.     void display()
  112.     {
  113.         int i;
  114.         if(isempty())printf("cant display as stack empty\n");
  115.         else
  116.         {
  117.  
  118.             for(i=s.top;i>=0;i--)
  119.             {
  120.  
  121.                 printf("%c ",s.items[i]);
  122.             }
  123.         }
  124.  
  125.     }
  126.  
Success #stdin #stdout 0s 10312KB
comments (?)
stdin
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1
hi there
stdout
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1.reverse line of text 2.palindrome check
enter any other key to quit
enter choice 
enter string to reverse 
reversed string is +a�iH
enter choice
https://ideone.com/veSM0u
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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