Question

write a c program to find reverse of a string using pointers
plz answer this question urgent...
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Answer 1

Answer:

// Function to reverse the string  

// using pointers  

void reverseString(char* str)  

{  

   int l, i;  

   char *begin_ptr, *end_ptr, ch;  

      // Get the length of the string  

   l = strlen(str);  

      // Set the begin_ptr and end_ptr  

   // initially to start of string  

   begin_ptr = str;  

   end_ptr = str;  

      // Move the end_ptr to the last character  

   for (i = 0; i < l - 1; i++)  

       end_ptr++;  

      // Swap the char from start and end  

   // index using begin_ptr and end_ptr  

   for (i = 0; i < l / 2; i++) {  

          // swap character  

       ch = *end_ptr;  

       *end_ptr = *begin_ptr;  

       *begin_ptr = ch;  

          // update pointers positions  

       begin_ptr++;  

       end_ptr--;  

   }  

}  

  // Driver code  

int main()  

{  

      // Get the string  

   char str[100] = "GeeksForGeeks";  

   printf("Enter a string: %s\n", str);  

      // Reverse the string  

   reverseString(str);  

      // Print the result  

   printf("Reverse of the string: %s\n", str);  

      return 0;  

}

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