How two add the values of two strings

Is there an easy way to add the values of two strings(containing integers) together?

Example:
string1={1234};
string2={4321};

How do you add the values together to get:

string3 = val of string1 + val of string2 ;
//string3 = {5555}

Is there a built in function for this?
m0neymanAsked:
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mnashadkaCommented:
atoi will put the strings into ints, like:
char s1[] = "1234";
char s2[] = "4321";
int value3 = atoi(s1) + atoi(s2);

If you're actually using strings then you need to convert them to const char *'s using c_str():
string s1 = "1234";
string s2 = "4321";
int value3 = atoi(s1.c_str()) + atoi(s2.c_str());

Then you can either use sprintf (for the old C way) or an ostringstream to put the int back into a string:
char s3[10];
sprintf(s3, "%d", value3);

or
ostringstream result;
result << value3;
string s3 = result.str();

Hope this helps.
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