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  1. #include <stdio.h>
  2. int fib1(int n)
  3. {
  4.     int f1=0,f2=1,f,i;
  5.  
  6.     for(i=0;i<n-1;i++)
  7.     {
  8.         f=f1+f2;
  9.         f1=f2;
  10.         f2=f;
  11.     }
  12.     return f2;
  13. }
  14.  
  15. int fib2(int n)
  16. {
  17.     int f[100],i;
  18.  
  19.     f[0]=0;
  20.     f[1]=1;
  21.     for(i=2;i<=n;i++)
  22.     f[i]=f[i-1]+f[i-2];
  23.  
  24.     return f[n];
  25. }
  26.  
  27. int fib3(int n)
  28. {
  29.     if(n==0)
  30.         return 0;
  31.     else if(n==1)
  32.         return 1;
  33.     else
  34.         return fib3(n-1)+fib3(n-2);
  35. }
  36.  
  37.  
  38. int main(void) {
  39.  
  40.     int n;
  41.     scanf("%d",&n);
  42.     printf("1:%d\n",fib1(n));
  43.     printf("2:%d\n",fib2(n));
  44.     printf("3:%d\n",fib3(n));
  45. 	return 0;
  46. }
  47.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/8bI166
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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