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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	double a;
  5. 	scanf("%1f",&a);
  6. 	printf("a=%f\n",a);
  7. 	printf("%f\n",3.14*a*a);
  8. 	return 0;
  9. }
  10.  
  11.  
Success #stdin #stdout 0s 5320KB
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stdin
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5
stdout
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a=0.000000
0.000000
https://ideone.com/9KIuG3
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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