Question

Write a program named as reverse.c that reads a message, then prints the reversal of the message. The output of the program should look like this: Enter a message: Don ’t get mad, get even. Reversal is : .neve teg ,dam teg t ’noD Hint: Read the message one character at a time (using getchar) and store the characters in an array. Stop Reading when the array is full or the character read is ‘\n’. The framework of reverse.c is as below: /* reverse.c */ #include #define N 50 int main(){ int arr[N],i=0; char ch; printf("Enter a message: "); /* Put code here to get input from user by using getchar() */ printf("Reversal is: "); } /* Put code here to print out the reversal by using putchar()*/ printf("\n"); return 0;

Answer 1

Explanation:

#include <stdio.h>

#define N  20

int main()

{

   char str[N];

   char reverse[N];

   int c;

   int i;

   int j;

   int k;

   int flag=0;

   printf("Enter a string: ");

   i=0;

   j=0;

   while((i<N)&&((c=getchar())!='\n')){

       str[i] = c;

       i++;

   }

   k=i;

   while((j<=k)&&(i>=0)){

       reverse[j]=str[i];

       j++;

       i--;

       flag=1;

   }

   i=0;

   while(i<=k){

       putchar(reverse[i]);

       i++;

   }

   return 0;

}

• The first while loop will read the string character wise.

• while((i<N)&&((c=getchar())!='\n')) : This statement will check whether it has reached the end of the line or the specific number of characters are reached.

• 2nd file loop will reverse the string and transfer to another array.

• Third loop will print the reversed string.