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  1. // type_cast.c
  2. #include <stdio.h>
  3.  
  4. int main(void)
  5. {
  6.     const int a = 2;
  7.     double b1, b2;
  8.  
  9.     b1 = 1.0 / a;  // aが自動的に(double)aとして処理される
  10.     b2 = 1.0 / (double)a;
  11.  
  12.     printf("1.0 / a: %lf\n", b1);  // => "1.0 / a: 0.500000
  13.     printf("1.0 / (double)a: %lf\n", b2);  // => 1.0 / (double)a: 0.500000
  14.  
  15.     b1 = 1 / a;  // (1 / a)が自動的に(double)(1 / a)として処理される
  16.     b2 = 1 / (double)a;  // (1)が自動的に(double)(1)として処理される
  17.  
  18.     printf("1 / a: %lf\n", b1);  // => 1 / a: 0.000000
  19.     printf("1 / (double)a: %lf\n", b2);  // => 1 / (double)a: 0.500000
  20.  
  21.     return 0;
  22. }
Success #stdin #stdout 0.01s 5356KB
comments (?)
stdin 
Standard input is empty
stdout 
1.0 / a: 0.500000
1.0 / (double)a: 0.500000
1 / a: 0.000000
1 / (double)a: 0.500000
https://ideone.com/fQ0M0L
language:
C (gcc 8.3)
created:
357 days ago
visibility:
secret

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