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#include <iostream>
#include <string>
using namespace std;
 
int main() {
	short j;
	for(int i = 0; i < 20; ++i++){
		j = i/2;
		count << "i:" << String(i) << "\tj:" << String(j) << endl;
	}
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:7:28: error: lvalue required as increment operand
  for(int i = 0; i < 20; ++i++){
                            ^
prog.cpp:9:3: error: 'count' was not declared in this scope
   count << "i:" << String(i) << "\tj:" << String(j) << endl;
   ^
prog.cpp:9:28: error: 'String' was not declared in this scope
   count << "i:" << String(i) << "\tj:" << String(j) << endl;
                            ^

Standard output is empty