Questions tagged [length-modifiers]
5 questions
194
votes
5 answers
Why does scanf() need "%lf" for doubles, when printf() is okay with just "%f"?
Why is it that scanf() needs the l in "%lf" when reading a double, when printf() can use "%f" regardless of whether its argument is a double or a float?
Example code:
double d;
scanf("%lf", &d);
printf("%f", d);
raldi
- 21,344
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4
votes
2 answers
How to separate format specifiers from characters with printf
Another way to phrase this question might be "How to end format specifiers in printf"
If I want to print microseconds in this format 100us using the following code...
long microseconds = 100L;
printf("%lus", microseconds);
only prints 100s because…
baconcheese113
- 843
- 2
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4
votes
2 answers
What is the difference between the %PRId and %d format characters?
Consider the following code:
#include
#include
void main(void)
{
int32_t a = 44;
fprintf(stdout, "%d\n", a);
fprintf(stdout, "%"PRId32"\n", a);
}
When is it better to use %d and when would it be better to use…
user7659542
0
votes
1 answer
Format specifier %Lf for long double in C is not working as if expected
While studying the C essentials from online video, the author shared the code below to find the difference between float, double and long double.
I ran this program in Eclispse running in 64 bit Windows 10 Laptop.
#include
#include…
prasanth_ntu
- 19
- 1
- 7
-1
votes
1 answer
About conversion specifier of scanf in C
I have a question about conversion specifier of scanf in C.
#include
int main(void)
{
int num1;
scanf("%hhd",&num1);
printf("%d \n",num1);
}
Since I have typed "%hhd" as the conversion specifier in scanf function, when my…
Jin
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