Question

Write in C. Simple Program (beginner)

Assignment: Write a program Character Pointers and Functions. (like program #5-5). Keyboard input to enter one character string. Using a single dimension array, populate the array with the character string, call a function using pointers to reverse order the character string, pass back to the main the output and total_count_of_characters. (maybe use a global variable for the total count). Print display the reversed char string and total_count. <END>

Answer 1

#include <stdio.h>
#include <stdlib.h>

int total_count = 0;

char* reverseString(char* str){
   int i = 0, j;
   char ch;
   
   while(*(str+i)!='\0'){
      i+=1;
      total_count += 1;
   }
   
   i = 0, j = total_count-1;
   while(i<j){
      ch = *(str+i);
      *(str+i) = *(str+j);
      *(str+j) = ch; 
   }
   return str;
}

int main()
{
   char* str = (char*)malloc(sizeof(char)*100);
   printf("Enter string: ");
    scanf(" %[^\t\n]s",&str);
    
    str = reverseString(str);
    
    printf("Reversed string: %s\n",str);
    printf("Total count of characters: %d\n",total_count);
    
    return 0;
}

Note: Please comment below if you have any doubts