Question

•Create a project in Visual Studio (C++)

•Have a function that compares two C-Strings (similar to strcmp)

•Have a function that copies one string to another string (strcpy)

•Have a function that returns a persons first name only

•I enter Bobby Loneker to the system, this function should cut my last name off

•Have a function that returns a C-string backwards

•I enter Bobby to the system it returns: ybboB

Answer 1

Given below is the code for the question. Please do rate the answer if it helped. Thank you.

#include <iostream>
using namespace std;
int my_strcmp(char *s1, char *s2);
void my_strcpy(char *src, char *dest);
void get_firstname(char *src, char *fname);
void my_strrev(char *src, char *dest);

int main(){
   char s1[20], s2[20];
  
   cout << "Enter 2 strings to compare- " << endl;
   cout << "\t string1? ";
   cin.getline(s1, 20);
   cout << "\t string2? ";
   cin.getline(s2, 20);
  
   if(my_strcmp(s1, s2) == 0)
       cout << s1 << " = " << s2 << endl;
   else if(my_strcmp(s1, s2) < 0)
       cout << s1 << " < " << s2 << endl;
   else
       cout << s1 << " > " << s2 << endl;
  
   cout << endl << "copying s1 to s2" << endl;
   my_strcpy(s2, s1);
   cout << "s1 = " << s1 << endl;
   cout << "s2 = " << s2 << endl;
  
  
   cout << endl << "Enter your full name: ";
   cin.getline(s1, 20);
   get_firstname(s1, s2);
   cout << "Your firstname is " << s2 << endl;
  
   cout << endl << "Enter a string to reverse: ";
   cin.getline(s1, 20);
   my_strrev(s1, s2);
   cout << "Reverse is " << s2 << endl;
  
   return 0;
}

int my_strcmp(char *s1, char *s2){
   int i = 0;
   while(s1[i] != '\0' && s2[i] != '\0')
   {
       if(s1[i] < s2[i])
           return -1;
       else if(s1[i] > s2[i])
           return 1;
       i++;
   }
  
   if(s1[i] == '\0')
   {
       if(s2[i] == '\0')
           return 0;
       else
           return -1;
   }
   else
       return 1;

}

void my_strcpy(char *dest, char *src ){
   int i = 0;
   while(src[i] != '\0')
   {
       dest[i] = src[i];
       i++;
   }
   dest[i] = '\0';
}

void get_firstname(char *src, char *fname)
{
   int i = 0;
   while(src[i] != '\0' && src[i] != ' ')
   {
       fname[i] = src[i];
       i++;
   }
   fname[i] = '\0';
}

void my_strrev(char *src, char *dest)
{
   int i = 0, j = 0;
   while(src[i] != '\0')
       i++;
  
   i--;
   while(i >= 0){
       dest[j] = src[i];
       i--;
       j++;
   }
   dest[j] = '\0';
}

output
----
Enter 2 strings to compare-
string1? hello
string2? world
hello < world

copying s1 to s2
s1 = hello
s2 = hello

Enter your full name: Bobby Loneker
Your firstname is Bobby

Enter a string to reverse: Bobby
Reverse is ybboB