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Fix segmentation fault in calc sample

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Segmentation fault occurred in `calc` sample
when no variables are given from command line argument:

```
$ cd sample
$ make calc64
$ ./calc64 "" "123"
varTbl = { }
64bit mode
zsh: segmentation fault  ./calc64 "" "123"
```

`put` function always access `x[0]`,
but segmentation fault occurred when `x.size() == 0`.
This commit is contained in:
tyfkda 2020-01-15 09:10:10 +09:00
parent 8f696e93d1
commit 47922ed96c
1 changed files with 3 additions and 3 deletions
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6
sample/calc.cpp
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@ -155,9 +155,9 @@ struct Grammar : public boost::spirit::classic::grammar<Grammar> {
void put(const std::vector<double>& x)
{
printf("%f", x[0]);
for (size_t i = 1, n = x.size(); i < n; i++) {
printf(", %f", x[i]);
for (size_t i = 0, n = x.size(); i < n; i++) {
if (i > 0) printf(", ");
printf("%f", x[i]);
}
}