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#define BUFFSIZE 100
//...
char output[BUFFSIZE];
sprintf(output,"%d%d%d",a,b,c);
#include <iostream>
#include <cstring>
using namespace std;
char* AddInt(char* buff, int n)
{
sprintf(buff + strlen(buff),"%d", n);
return buff;
}
int main()
{
int a = 200, b = 300, c = 400;
char buff[256]={0};
AddInt(AddInt(AddInt(buff, a), b), c);
cout << buff << endl;
return 0;
}