Jun 20, 2023 · In printf(), %lf and %f are interchangeble because any variadic arguments of type float get converted to double by the default argument promotion rules that apply to all function . Sep 16, 2014 · Thus, it seems prudent to avoid %lf in format strings for printf family functions to achieve maximum compatibility across compilers AND to avoid bizarre undefined behavior, . %f for float %lf for double %Lf for long double It just so happens that when arguments of type float are passed as variadic parameters, such arguments are implicitly converted to type double. .
20 Format %lf is a perfectly correct printf format for double, exactly as you used it. There's nothing wrong with your code. Format %lf in printf was not supported in old (pre-C99) versions of C . Jan 21, 2016 · Here is my small program where I intently put the place holder %lf in the second printf. Why the second printf has the same result as the first printf( both printf 1.3). int main() { . Feb 7, 2017 · %f是以float类型格式化输入或输出，%lf是long float的意思（估计是和%ld对应），也就是指double类型。 scanf读%f时，系统会按照4字节长度来读，读完要放到一个4字节的空间 .
Feb 20, 2022 · f表示float，lf表示double，但是printf中实际上只有f没有lf，后来加上了也并没有任何区别。 为什么printf会有这样的行为，是因为printf的函数签名是变长参数的，而变长参数，因 . Oct 12, 2009 · I'd like to know the difference (with examples if possible) between CR LF (Windows), LF (Unix) and CR (Macintosh) line break types. Jun 22, 2010 · What is the meaning of the following control characters: Carriage return Line feed Form feed
Oct 24, 2021 · printf("%lf", num); These two have exactly the same effect. In this case, the "l" modifier is effectively ignored. The reason they have the same effect is that printf is special. .
- Are %f and %lf interchangeable when using printf?
- In printf(), %lf and %f are interchangeble because any variadic arguments of type float get converted to double by the default argument promotion rules that apply to all function.
- What is the difference between %f and %lf in C?
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Why does scanf() need "%lf" for doubles, when printf() is okay. For readers, this helps frame potential impact and what to watch next.
FAQ
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Correct format specifier for double in printf - Stack Overflow.
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C - Meaning of "%lf" place holder - Stack Overflow.
What should readers monitor next?
Here is my small program where I intently put the place holder %lf in the second printf.
Sources
- https://stackoverflow.com/questions/76515206/are-f-and-lf-interchangeable-when-using-printf
- https://stackoverflow.com/questions/25860850/what-is-the-difference-between-f-and-lf-in-c
- https://stackoverflow.com/questions/210590/why-does-scanf-need-lf-for-doubles-when-printf-is-okay-with-just-f
- https://stackoverflow.com/questions/4264127/correct-format-specifier-for-double-in-printf
