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Line 56:
using namespace std;
std::string s = "12345";
int i = atoi((const char*)s.c_str()) + 1;▼
int i;
std::istringstream(s) >> i;
//or:
▲ //int i = atoi((const char*)s.c_str()) + 1;
std::ostringstream oss;
if (oss << i) s = oss.str();
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