Question

how would you change all the character of a string to uppercase in c++

Answer 1

Create a lookup table with 26 positions indexed by the ASCII value of the character to be changed. The value in the lookup table at a particular location is the upper case ASCII value.

Answer 2

int i = 0;
while( string[i] )
{
if( string[i] >= 'a' ) && ( string[i] <= 'z' )
string[i] &= 0xDF; // or
string[i] = tolower( string[i] ); // you'll need: #include <cctype>
}

Answer 3

//This program convert the string to upper case

#include<iostream>
#include<cstring>
#include <cctype>

using namespace std;
int main()
{

string str ="my real name is secret munyai from university of limpopo south africa";
int leng=str.length();
cout <<"your string :";

for (int i=0 ;i<=leng-1 ;i++)
{
cout<<str[i];
}
cout<< "\n your string is now in upper cass :"<<endl;
//convert to upper case
for (int i=0 ;i<=leng-1 ;i++)
{
str[i]=toupper(str[i]);
cout<<str[i];

}

cout<<endl;
return 0;
}