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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. char *print_x(char *str)
  5. {
  6.     union
  7.     {
  8.         int i;
  9.         unsigned u;
  10.         long l;
  11.         long long ll;
  12.         float f;
  13.         double d;
  14.     }data;
  15.  
  16.     switch(*str)
  17.     {
  18.         case 'd':
  19.             memcpy(&data, str + 1, sizeof(double));
  20.             printf("%f", data.d);
  21.             return str + 1 + sizeof(double);
  22.         case 'i':
  23.             memcpy(&data, str + 1, sizeof(int));
  24.             printf("%d", data.i);
  25.             return str + 1 + sizeof(int);
  26.         /* another formats */
  27.         default:
  28.             printf("Not implemented");
  29.             return NULL;
  30.     }
  31. }
  32.  
  33. int main()
  34. {
  35.     char data[100];
  36.     double x = 1.234;
  37.     int z = 4567;
  38.  
  39.     char *str = data;
  40.  
  41.     data[0] = 'd';
  42.     memcpy(&data[1], &x, sizeof(double));
  43.     data[1 + sizeof(double)] = 'i';
  44.     memcpy(&data[2 + sizeof(double)], &z, sizeof(int));
  45.  
  46.     while((str = print_x(str)))
  47.     {
  48.     	printf("\n");
  49.     }
  50.  
  51.     return 0;
  52. }
  53.  
Success #stdin #stdout 0s 9424KB
comments (?)
stdin 
Standard input is empty
stdout 
1.234000
4567
Not implemented
https://ideone.com/178ALz
language:
C (gcc 8.3)
created:
6 years ago
visibility:
secret

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