How will Calculate the string

[jmanikandan]

char str[20]="15+20+18-10"

here how will convert the string as integer and negelate the Symbols. And calculate these numbers.
Please help me.

Output : 43

[Syuf]

#include <iostream>
#include <sstream>

using namespace std;


int main()
{
	istringstream strin("15+20+18-10");

	int result = 0;
	strin >> result;
	
	char sign; int next;
	while(strin >> sign >> next)
		result += next * (sign == '-' ? (-1) : 1);
	cout << result;

	return 0;
}