How to replace certain items in a char array with an integer in C++? -

below example code not working way want.

#include <iostream>  using namespace std;  int main() { char testarray[] = "1 test";  int numreplace = 2; testarray[0] = (int)numreplace; cout<< testarray<<endl; //output "? test" wanted 2, not '?' there                         //i trying different things , hoping (int) helped  testarray[0] = '2'; cout<<testarray<<endl;//"2 test" want, hardcoded in                       //is there way based on variable?  return 0; } 

in string characters , integers, how go replacing numbers? , when implementing this, different between doing in c , c++?

if numreplace in range [0,9] can :-

testarray[0] = numreplace + '0';

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if numreplace outside [0,9] need

• a) convert numreplace string equivalent
• b) code function replace part of string evaluated in (a)

ref: best way replace part of string in c , other relevant post on so

also, since c++ code, might consider using std::string, here replacement, number string conversion, etc simpler.