Question

Code in C++

Function Prototypes

For the second part of the lab activity, you will be practicing writing function prototypes. Continue working on the same project from part A. First, rewrite the code so that you are using function prototypes for the functions getNumber.getMessage, and repeat. Remember that the prototypes go at the top of the file, followed by main, then the definitions of the three functions at the end. Second, you will be creating a new function (procedure) called repeatTwo. It should have a void return type. Use the following prototype: void repeat Two(int, string, string); The function is similar to the repeat function. The difference is that instead of repeating just one message, it's going to repeat two messages. You should use a different loop structure to handle this than the one you used for repeat. Third, you will need to modify the main function to give the user a choice of which repeating function to call. If the user wants the first version, then it should follow the same logic as in part A. But if the user chooses the second version (repeatTwo), then you will need to get an additional message from the user. Hence, you will need an extra function call to get Message.

Answer 1

#include <iostream> #include <string> #include <limits using namespace std; // these are the prototypes before the main funciton // the function getNumber takes a number from the user int getNumber (); 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 // the function getMessage takes the message from the user string getMessage(); //the funciton repeat the only one string void repeat (int , string); //the function repeat the two strigs void repeatTwo(int , string , string);

27 20 //main function start of execution 21 int main() 22 { 23 // declare the variabel choice to know user choice 24 int choice; 25 26 // ask the user to enter 1 or 2 cout<<"Enter 1 to repeat one message or enter 2 to repeat two messages: "; 28 cin>>choice; 29 30 // check if the user entered 1 if so then do the following 31 if (choice == 1){ 32 33 // make a call to the getNumber to get number times to repeat string 34 int a = getNumber(); 35 36 // make a call to getMessage to get the message form the user 37 string b = getMessage(); 38 39 // Then call the method repeat to print the string a times 40 repeat (a, b); 41 42 }

// check if the choice is 2 then do the following if (choice == 2 ) { // make a call to the getNumber to get number times to repeat string int a = getNumber(); // make a call to getMessage to get the message from the user string 1 string b = getMessage(); 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 // make a call to getMessage to get the message from the user string 2 string c = getMessage(); // now make a call to the repeatTwo and pass the a and two strings to print cout<<"\n"; repeatTwo(a,b,c); } return 0; }

67 64 // definition of the funcitons 65 66 //this method return the value entered by the user int getNumber ( ) 689 { 69 70 int a; 71 72 // ask the user to enter a number 73 cout <<"Enter a number: "; 74 75 // store the number in a 76 cin >> a; 77 78 // return the number 79 return a; 80 L}

82 // This function reads the string and return the string 84 string getMessage(){ 85 86 // the below line ignore the new line after one input is taken 87 cin.ignore(numeric_limits < streamsize>::max(), '\n'); 88 89 90 string b; 91 92 // ask the user to enter the string 93 cout << "Enter a message: "; 94 95 // read the string to b 96 getline(cin,b); 97 98 // return the string 99 return b; 100 101 } 102

102 103 //this function repeat one string only 104 void repeat (int a, string b){ 105 106 // using for Loop to print the string 107 for (int i=0; i<a; i++){ 108 109 // print the string 110 cout <<b«<" \n"; 111 } 112 113 } 114 115 //this function takes two strings and print them 116 void repeatTwo(int a, string b, string c){ 117 118 // use while loop until a becomes zero iterate it. 119 while(a--){ 120 121 print the strings 122 cout<<b<<"\n"; 123 cout<<c<<"\n"; 124 125 } }

C:\Desktop\dev\Prototypes.exe Enter 1 to repeat one message or enter 2 to repeat two messages: 1 Enter a number: 5 Enter a message: Same as part 1. Same as part 1. Same as part 1. Same as part 1. Same as part 1. Same as part 1. Process exited after 19.36 seconds with return value o Press any key to continue . .

C:\Desktop\dev\Prototypes.exe Enter 1 to repeat one message or enter 2 to repeat two messages: 2 Enter a number: 3 Enter a message: This one is different Enter a message: Functions!!! This one is different Functions!!! This one is different Functions!!! This one is different Functions!!! Process exited after 29.42 seconds with return value o Press any key to continue ..

Code:

#include <iostream>
#include <string>
#include <limits>
using namespace std;

// these are the prototypes before the main funciton
// the function getNumber takes a number from the user
int getNumber ();

// the function getMessage takes the message from the user
string getMessage();

//the funciton repeat the only one string
void repeat (int , string );

//the function repeat the two strigs
void repeatTwo(int , string , string );

//main function start of execution
int main()
{
//   declare the variabel choice to know user choice
   int choice;
  
//   ask the user to enter 1 or 2
   cout<<"Enter 1 to repeat one message or enter 2 to repeat two messages: ";
   cin>>choice;
  
//   check if the user entered 1 if so then do the following
   if(choice == 1){
  
//   make a call to the getNumber to get number times to repeat string
   int a = getNumber( );

//   make a call to getMessage to get the message form the user
   string b = getMessage( );
  
//   Then call the method repeat to print the string a times
   repeat (a, b);
  
   }
  
//   check if the choice is 2 then do the following
   if(choice == 2 ){
      
//       make a call to the getNumber to get number times to repeat string
       int a = getNumber();
      
//       make a call to getMessage to get the message from the user string 1
       string b = getMessage();
      
//       make a call to getMessage to get the message from the user string 2
       string c = getMessage();
      
//       now make a call to the repeatTwo and pass the a and two strings to print
       cout<<"\n";
       repeatTwo(a,b,c);
   }

return 0;
}

// definition of the funcitons

//this method return the value entered by the user
int getNumber ( )
{
  
   int a;
  
//   ask the user to enter a number
   cout <<"Enter a number: ";
  
//   store the number in a
   cin >> a;
  
//   return the number
   return a;
}

// This function reads the string and return the string
string getMessage(){
  
//   the below line ignore the new line after one input is taken
   cin.ignore(numeric_limits < streamsize>::max(),'\n' ) ;

   string b;

//    ask the user to enter the string
   cout << "Enter a message: ";

//   read the string to b
   getline(cin,b);

//   return the string
   return b;

}

//this function repeat one string only
void repeat (int a, string b){
  
//   using for loop to print the string
   for (int i=0; i<a; i++){

//       print the string
       cout <<b<<" \n";
}

}

//this function takes two strings and print them
void repeatTwo(int a,string b,string c){
  
//   use while loop until a becomes zero iterate it.
   while(a--){
      
//       print the strings
       cout<<b<<"\n";
       cout<<c<<"\n";
   }
}

Note : If you have any queries regarding the code please make a comment.