How to find all palindrome strings in a text file using C?

Question

Take input 'n' as number of strings and find the common alphabet among them.
For example:
Input:

Number of Strings - 3
List of Strings - 
abcdde
baccd
eeabg

output:

2   

as 'a' and 'b' are only two common alphabet among those three strings

Answer 1

#include<stdio.h>
#include<conio.h>
int stpal(char str[50], int st, int ed);
void main()
{
char str[50];
int pal = 0, len = 0, i, start = 0, end;
clrscr();
printf(“\n\n\t ENTER A SENTENCE…: “);
gets(str);
while(str[len]!=’\0′)
len++;
len–;
for(i=0;i<=len;i++)
{
if((str[i] == ‘ ‘ && str[i+1] != ‘ ‘) || i == len)
{
if(i == len)
end = i;
else
end = i – 1;
if( stpal (str, start, end ) )
pal++;
start = end + 2;
}
}
printf(“\n\n\t THE TOTAL NUMBER OF PALINDROMES ARE..: %d”,pal);
getch();
}
int stpal(char str[50], int st, int ed)
{
int i, pal=0;
for(i=0; i<=(ed-st)/2; i++)
{
if(str[st+i] == str[ed-i])
pal = 1;
else
{
pal = 0;
break;
}
}
return pal;
}