putting an integer into a string - c++

Question

I'm trying to put an integer into a string by separating its digits and putting them by order in a string of size 3
this is my code:
char pont[4];
void convertInteger(int number){
int temp100=0;
int temp10=0;
int ascii100=0;
int ascii10=0;
if (number>=100) {
temp100=number%100;
ascii100=temp100;
pont[0]=ascii100+48;
number-=temp100*100;
temp10=number%10;
ascii10=temp10;
pont[1]=ascii10+48;
number-=temp10*10;
pont[2]=number+48;
}
if (number>=10) {
pont[0]=48;
temp10=number%10;
ascii10=temp10;
pont[1]=ascii10+48;
number-=temp10*10;
pont[2]=number+48;
}
else{
pont[0]=48;
pont[1]=48;
pont[2]=number+48;
}
}
here's an example of what's suppose to happen:
number = 356
temp100 = 356%100 = 3
ascii100 = 3
pont[0]= ascii100 = 3
temp100 = 3*100 = 300
number = 365 - 300 = 56
temp10 = 56%10 = 5
ascii10 = 5
pont[1]= ascii10 = 5
temp10 = 5*10 = 50
number = 56 - 50 = 6
pont[2]=6
I might have an error somewhere and not seeing it (don't know why) ...
This is suppose to be C++ by the way. I might be mixing this up with C language...
Thanks in advance

Answer 1

Probably the mistake that you're overlooking right now:
pont[2]=number+48;
}
if (number>=10) { /* should be else if */
pont[0]=48;
However, I'd like to suggest a different approach; you don't care that the value is above 100, 10, etc., as 0 is still a useful value -- if you don't mind zero-padding your answer.
Consider the following numbers:
int hundreds = (number % 1000) / 100;
int tens = (number % 100) / 10;
int units = (number % 10);

Answer 2

All built-in types know how to represent themselves to std::ostream. They can be formatted for precision, converted to different representations, etc.
This uniform handling allows us to write built-ins to the standard output:
#include <iostream>
int main()
{
std::cout << 356 << std::endl; // outputting an integer
return 0;
}
Output:
356
We can stream to more than just cout. There is a standard class called std::ostringstream, which we can use just like cout, but it gives us an object which can be converted to a string, rather than sending everything to standard output:
#include <sstream>
#include <iostream>
int main()
{
std::ostringstream oss;
oss << 356;
std::string number = oss.str(); // convert the stream to a string
std::cout << "Length: " << number.size() << std::endl;
std::cout << number << std::endl; // outputting a string
return 0;
}
Output:
Length: 3
356