To output to n decimal places of circumference
Asked 2 years ago, Updated 2 years ago, 157 viewsHi, everyone. Input: n is entered within 25 and output: output: from below the decimal point of the circumference to n digits.
#include <stdio.h>
int main() {
int n;
char py[30] = "3.14159265358979323846264";
scanf("%d", &n);
n + = 2; //"3." Add 2 to n because this part is 2 characters long.
for (int i = 0; i < n; i++) {
printf("%c", py[i]);
}
return 0;
}
There are many other ways to print it out by replacing it with a string, such as the above code. But the way I thought about printing it out in real numbers is
#include <stdio.h>
int main() {
int n;
double py = 3.14159265358979323846264;
scanf("%d", &n);
printf("%.%df", n, py);
return 0;
}
It's something like this. Of course, it failed and %df was printed (%.% in a row) and "%" escaped. "." is not printed.) The output up to the decimal point can be an integer, but is it too much for a variable? Or should I cut it before I print it out? I'm sorry to bother you with this question.
c float
2 Answers
#include <stdio.h>
int main()
{
double pi = 3.14159265358979323846264;
int i;
for (i = 0; i < 15; i++)
printf("%.*lf\n", i, pi);
return 0;
}
3
3.1
3.14
3.142
3.1416
3.14159
3.141593
3.1415927
3.14159265
3.141592654
3.1415926536
3.14159265359
3.141592653590
3.1415926535898
3.14159265358979
If the precision specification is an asterisk (*), an int argument from the argument list supplies the value. In the argument list, the precision argument must precede the value that's being formatted, as shown in this example:
printf( "%.*f", 3, 3.14159265 ); /* 3.142 output */
The first argument of the printf function can be in the form of a string.
You can put a " type of string directly, but you can also use a string stored in the array. So you can do what you want to do if you create a string in advance with the printf function and then put that string in the printf function.
code.
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main()
{
double py = 3.14159265358979323846264;
char format_str[20] = { 0, };
int n;
scanf("%d", &n);
sprintf(format_str, "%%.%df", n);
printf(format_str, py);
return 0;
}
If you have any answers or tips
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