I am studying C and C ++ and would like to understand how I could transform this code written with printf() into cout , or how to use the %d %x %c , etc. functions. no cout .
int main()
{
printf("i make %d program \n" , 2)
system("PAUSE");
return 0;
}
Example
int n = 5; cout < n;
You have printed the value 5 ...
To print in hexadecimal, cout < hex < < n;
And so on, there are several modellers for C ++, you can learn them, on youtube, by searching c ++ workbook, pdf's, basic courses ..
You should study stream io and your manipulators . Example:
#include <iostream>
using namespace std;
int main() {
auto x = 65;
cout << "i make " << x << " program\n";
cout << "i make " << hex << x << " program " << endl;
cout << "i make " << (char)x << " program " << endl;
}
See running on ideone . And in Coding Ground . Also I placed GitHub for future reference .
printf() works with conventions where it replaces a part of the text with something that comes as a parameter , and what is used there as placeholder determines what to do. C ++ uses data streams that are queuing up and producing a result. So he goes on assembling each element and the first item is who gets everything that comes after. The cout is output to the console .
Obviously knowing the value is best put all together in a string only. It is only legal to use this when you do not know what you will have in the placeholder , so in this case we will understand that this x would be a value that comes externally.
The second example calls a handler before sending it to the output, and the hex changes the output format from hexadecimal to number, as %x would do.
I have also used \n and endl , to append both ends of a line have differences between them (see link above).
The third example had to convert from number to char on the hand. Good C compilers configured properly require the same. Note that the stream does not care what kind comes. If the type has a stream set it will know what to do. All basic language types have, and all types should have some stream operator set up, it's like a ToString() of other languages.
In the posted documentation there are several other very useful modifiers for formatting the data. You can even create your own with a little more knowledge.