stringstream to array

Question

could you tell me, why is this wrong?

I have

mytype test[2];
stringsstream result;
int value;

for (int i=0; i<2; i++) {
   result.str("");
   (some calculating);
   result<< value;
   result>> test[i];
}

When I watch to test array - only first - test[0] - has correct value - every other test[1..x] has value 0 why its wrong and not working? in first run in cycle the stringstream set the correct value to array, but later there is only 0?

thanks

Xeo · Accepted Answer · 2011-02-12 11:38:38Z

4

Try result.clear()ing your stringstream before flushing it with result.str(""). This sets it to a state of accepting inputs again after outputting the buffer.

#include <sstream>
using namespace std;

int main(){
    int test[2];
    stringstream result;
    int value;

    for (int i=0; i<2; i++) {
        result.clear();
        result.str("");
        value = i;
        result<< value;
        result>> test[i];
    }

    return 0;
}

Without clearing I get test[0] == 0 and test[1] == -832551553 /*some random number*/. With clear I get the expected output of test[0] == 0 and test[1] == 1.

edited Feb 12, 2011 at 11:38

answered Feb 12, 2011 at 11:30

Xeo

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