Write a C program that asks the user to enter a positive integer (the integer co

Question

Write a C program that asks the user to enter a positive integer (the integer could be of any number of digits in the range of the integer type) and replace each digit by the sum of that digit plus 6 modulus 10. The program then should swap the first digit with the last digit before it displays the output.

A sample input/output:

Enter the number of digits of the number: 5

Enter the number: 92828

Output: 48485

1)Name your program replace2.c.

2) The user will enter the total number of digits before entering the number.

3) You can use format specifier "%1d" in scanf to read in a single digit into a variable (or an array element). For example, for input 101011, scanf("%1d", &num) will read in 1 to num.

4) As part of the solution, write and call the function replace() with the following prototype. The replace() function assumes that the digits are stored in the array a and computes the replaced digits and store them in the array b. c represents the size of the arrays. void replace(int *a, int *b, int n); The replace() function should use pointer arithmetic – not subscripting – to visit array elements. In other words, eliminate the loop index variables and all use of the [] operator in the function.

5) As part of the solution, write and call the function swap() with the following prototype. void swap(int *p, int *q); When passed the addresses of two variables, the swap() function should exchange the values of the variables: swap(&i, &j); /* exchange values of i and j */

Explanation / Answer

#include<stdio.h>  
#include<stdlib.h>   
#include<unistd.h>  
  
void replace(int *a, int *b, int n){
   int i;  
   for (i=0;i<n;i++){
       *b++= (*a++ + 6)%10;
        }
}

void swap(int *p, int *q){
   int temp;
   temp = *p;
   *p = *q;
   *q = temp;
  
}

int main() {  
   int num, number,i;  
   printf("Enter the number of digits of the number: ");
   scanf("%d",&num);
   printf("Enter the number: ");
   scanf("%d",&number);
   int a[num],b[num];
   i = num-1;
   do {
       a[i] = number % 10;
       number /= 10;
       i--;
   } while (number != 0);

   replace(a, b,num);
  
  
   swap(&b[0],&b[num-1]);
  
       for (i=0;i<num;i++){
       printf("%d",b[i]);
        }
   printf(" ");
   return 0;  
}

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