i write a point class, when i compile , vs2008 give me the warning about" not all control parth return a value" could you please tell how to avoid that?
double& operator [](int i) //[] which can used as the left value
{
if(i==0) return x;
else if(i==1) return y;
else if(i==2) return z;
else cerr<<"our of rand index of Point";
}double& operator [](int i) //[] which can used as the left value
{
if(i==0) return x;
else if(i==1) return y;
else if(i==2) return z;
else cerr<<"our of rand index of Point";
}The function has a return type of double which you have returned three times in your above code. The error is due to a lack of a 4th return from your if-else statement. You need to return or exit the function; or possibly some other solution that I can't think of at the moment.
else cerr<<"our of rand index of Point";
// either return here or exit() prior to the end of block of codei.e.
double& operator [](int i) //[] which can used as the left value
{
if(i==0) return x;
else if(i==1) return y;
else if(i==2) return z;
else{
cerr <<"our of rand index of Point";
// return 0.0 or
// exit(1)
// some sort of error handling
}
}double& operator [](int i) //[] which can used as the left value { if(i==0) return x; else if(i==1) return y; else if(i==2) return z; else cerr<<"our of rand index of Point"; }The function has a return type of double which you have returned three times in your above code. The error is due to a lack of a 4th return from your if-else statement. You need to return or exit the function; or possibly some other solution that I can't think of at the moment.
else cerr<<"our of rand index of Point"; // either return here or exit() prior to the end of block of codei.e.
double& operator [](int i) //[] which can used as the left value { if(i==0) return x; else if(i==1) return y; else if(i==2) return z; else{ cerr <<"our of rand index of Point"; // return 0.0 or // exit(1) // some sort of error handling } }
Thank you very much for your information. the 'exit(1)' works very well.
but "return 0.0 " will gives a warning about" return a temperary variable".
Regards.
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