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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5.  
  6. static unsigned o[31];
  7.  
  8. unsigned c(int a){
  9.    if (a>='a' && a<='z')
  10.       return a-'a';
  11.    if (a>='A' && a<='Z')
  12.       return a+'a'-'A';
  13.    switch (a){
  14.    case ' ':return 26;
  15.    case '.':return 27;
  16.    case ',':return 28;
  17.    case '-':return 29;
  18.    }
  19.    return 30;
  20. }
  21.  
  22. static int _;
  23.  
  24.  
  25. void mur(int j){
  26.    if (o[c(j)])
  27.       printf("[%c]: %-7d%c",j,o[c(j)],
  28.             (_=(_+1)%5)?' ':'\n');
  29. }
  30.  
  31. void hist(const char* a){
  32.    _=0;
  33.    for (int i=0;i<31;i++)
  34.       o[i]=0;
  35.    for (int i=strlen(a)-1;i>=0;i--)
  36.       o[c(a[i])]++;
  37.  
  38.    printf("text:\n%s\n====\n",a);
  39.    for (int i=0;i<26;i++)
  40.       mur('a'+i);
  41.    mur(' ');
  42.    mur('.');
  43.    mur(' ');
  44.    mur('-');
  45.    printf("<another>: %d\n\n",o[30]);
  46. }
  47. int main(){
  48.    hist("test");
  49.    hist("The same issue will be exhibited by any classes/functions by-passing operator new to allocate memory, that is, by performing custom memory allocation followed by calls to the placement new operator. This is for instance typically the case of std::make_shared or std::allocate_shared for which is the solution is to use an aligned allocator as detailed in the solution for STL containers");
  50.    return 0;
  51. }
  52.  
Success #stdin #stdout 0s 4540KB
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stdin
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Standard input is empty
stdout
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text:
test
====
[e]: 1       [s]: 1       [t]: 2       <another>: 0

text:
The same issue will be exhibited by any classes/functions by-passing operator new to allocate memory, that is, by performing custom memory allocation followed by calls to the placement new operator. This is for instance typically the case of std::make_shared or std::allocate_shared for which is the solution is to use an aligned allocator as detailed in the solution for STL containers
====
[a]: 28      [b]: 6       [c]: 14      [d]: 9       [e]: 33     
[f]: 7       [g]: 3       [h]: 12      [i]: 22      [k]: 1      
[l]: 22      [m]: 9       [n]: 18      [o]: 30      [p]: 6      
[r]: 16      [s]: 27      [t]: 27      [u]: 6       [w]: 5      
[x]: 1       [y]: 9       [ ]: 59      [.]: 1       [ ]: 59     
[-]: 1       <another>: 7
https://ideone.com/Oczx4T
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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