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  1. #include <stdio.h>
  2. int main()
  3. {
  4.     int a;
  5.     scanf("%d",&a);
  6.     switch(a){
  7.         case 1:
  8.         {
  9.             int b,c;
  10.             printf("二つの数字を入力しなさい");
  11.             scanf("%d %d", &b, &c); 
  12.             printf("2*(%d + %d) = %d\n", b, c, 2 * (b + c));
  13.             break;
  14.         }
  15.  
  16.         case 2:
  17.         {
  18.             int d,e;
  19.             printf("二つの数字を入力しなさい");
  20.  
  21.             scanf("%d %d", &d, &e); 
  22.  
  23.             printf("%d * %d = %d\n", d, e, d * e); 
  24.             break;
  25.         }
  26.  
  27.         case 3:
  28.         {
  29.             int f,g,h;
  30.             printf("3つの数字を入力しなさい");
  31.  
  32.             scanf("%d %d %d", &f, &g, &h); 
  33.  
  34.             printf("%d * %d * %d = %d\n", f, g, h, f * g * h); 
  35.             break;
  36.         }
  37.  
  38.         default:
  39.         {
  40.             printf("不正な入力です\n");
  41.             break;
  42.         }
  43.     }
  44.     return 0;
  45. }
Success #stdin #stdout 0.01s 5320KB
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Standard input is empty
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不正な入力です
https://ideone.com/4rSKfX
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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