(C syntax) Calculate the circumference and area of the circle, and the circumference of the grammar circle

(C syntax) Calculate the circumference and area of the circle, and the circumference of the grammar circle

Knowledge point:

Header file # define usage

Usage of Float % f to control decimals.

 

Content: calculates the circumference and area of the circle.

Input description:

One row, radius value, real type

Output description:

Pi = the perimeter and area in 3.1415 cases (retain 2 decimal places), output in two rows

Input example: if the question is not specified, read the data in multiple groups or refer to a001.

10.0

Output example:

62.83 314.15

 

#include <stdio.h>#define pi 3.1415int main(){ float a; scanf("%f",&a); printf("%.2f\n%.2f\n",2*pi*a,pi*a*a); return 0;}

 

C language for circle perimeter and area

# Include <stdio. h>
# Define PHI 3.14
Void main ()
{
Float cir (float r );
Float area (float r );
Float r, c, s;
Printf ("input r = ");
Scanf ("% f", & r );
C = cir (r );
S = area (r );
Printf ("\ nc = % 5.2f s = % 5.2f", c, s );
}
Float cir (float r)
{Float c;
C = 2 * PHI * r;
Return (c );
}
Float area (float r)
{Float s;
S = PHI * r;
Return (s );
}

Primary C language question: Use two functions to separate the circle perimeter and area

# Include "stdio. h"
# Define Pi 3.1415926
Double zhouchang (double r)
{
Double s;
S = 2 * Pi * r;
Return s;
}
Double mianji (double r)
{
Double s;
S = Pi * r;
Return s;
}
Int main ()
{
Double r, m, n;
Printf ("enter the circle radius :");
Scanf ("% lf", & r );
M = zhouchang (r );
N = mianji (r );
Printf ("the circumference of the circle is % lf, and the area is % lf \ n", m, n );

}