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Nasal-Interpreter
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⚡ can convert minimum double from string

This commit is contained in:
ValKmjolnir 2023-10-11 00:20:02 +08:00
parent 0b179bf5ff
commit 80f9fc5842
2 changed files with 8 additions and 3 deletions
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9
src/nasal_misc.cpp
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@ -120,7 +120,8 @@ f64 oct2f(const char* str) {
// but this also makes 0.1+0.2==0.3,
// not another result that you may get in other languages.
f64 dec2f(const char* str) {
f64 ret = 0, negative = 1, num_pow = 0;
f64 ret = 0, num_pow = 0;
bool negative = false;
while('0'<=*str && *str<='9') {
ret = ret*10+(*str++-'0');
}
@ -147,7 +148,7 @@ f64 dec2f(const char* str) {
return nan("");
}
if (*str=='-' || *str=='+') {
negative = (*str++=='-'? -1:1);
negative = (*str++=='-');
}
if (!*str) {
return nan("");
@ -159,7 +160,9 @@ f64 dec2f(const char* str) {
if (*str) {
return nan("");
}
return ret*std::pow(10, negative*num_pow);
return negative?
ret*std::pow(10, 1-num_pow)*0.1:
ret*std::pow(10, num_pow-1)*10;
}
f64 str2num(const char* str) {

2
test/scalar.nas
View File

@ -234,4 +234,6 @@ for(var a=0;a<16;a+=1) {
}
print([0, 1, 2]~[3, 4, 5], "\n");
print(num("1.79769313486231570814527423731704357e+308"), "\n");
print(num("4.94065645841246544176568792868e-324"), "\n");