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  1. #include<stdio.h>
  2. #define PI 3.14
  3. int main()
  4. {
  5.     float r, C, S;
  6.     printf("please input r:");
  7.     scanf("%f", &r);
  8.     C = 2 * PI * r;   //周长公式
  9.     S = PI * r * r;   //面积公式
  10.     printf("C = %.2f\n", C);
  11.     printf("S = %.2f\n", S);
  12.     return 0;
  13. }
Success #stdin #stdout 0.01s 5312KB
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stdin
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7 8 9
stdout
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please input r:C = 43.96
S = 153.86
https://ideone.com/XtZaCF
language:
C++ 4.3.2 (gcc-4.3.2)
created:
1 day ago
visibility:
public

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