Question

I need this done in C++

Write a program with three functions: upper, lower, and reverse. The upper function should accept a pointer to a C-string as an argument. It should step through each character in the string, converting it to uppercase. The lower function, too, should accept a pointer to a C-string as an argument. It should step through each character in the string, converting it to lowercase. Like upper and lower, the reverse function should also accept a pointer to a C-string. As it steps through the string, it should test each character to determine whether it is uppercase or lowercase-lf a character is uppercase, it should be converted to lowercase. Likewise, if a character is lowercase, it should be converted to uppercase. Test the functions by asking for a string in function main, then passing it to them in the following order:reverse, lower, and upper

1. No global variables
2. No labels or go-to statements
3. No infinite loops, examples include:
   • for(;;)
   • while(1)
   • while(true)
   • do{//code}while(1);
4. No break statements to exit loops

Answer 1

#include<iostream>
using namespace std;
//method to convert string to lower case
void lower(char *c)
{

   for(int i=0;c[i]!='\0';i++)
   if(65<=c[i] and c[i]<=91)
   c[i]=c[i]+32;//increasing ascii value so that it becomes lowercase
  
  
}
void upper(char *c)
{   for(int i=0;c[i]!='\0';i++)
   if(97<=c[i] && c[i]<=123)
   c[i]=c[i]-32;
}

void reverse(char *c)
{
   for(int i=0;c[i]!='\0';i++)
   if(97<=c[i] && c[i]<=123)//then lower
   c[i]=c[i]-32;
   else
   c[i]=c[i]+32;;  
}
int main()
{
   //testing above methods
   char a[10];
   cout<<"Enter string :";
   cin>>a;
  
   cout<<"String: "<<a<<endl;
   reverse(a);
   cout<<"reverse :"<<a<<endl;
   upper(a);
   cout<<"upper :"<<a<<endl;
   lower(a);
   cout<<"lower :"<<a<<endl;
  
  
   return 0;
}

output:

Enter string :HellO
String: HellO
reverse :hELLo
upper :HELLO
lower :hello

Process exited normally.
Press any key to continue . . .