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  1. #include <stdio.h>
  2.  
  3. int str2int(char *s)
  4. {
  5.   char *p;
  6.   int r = 0;
  7.   for(p = s; *p; ++p)
  8.     if(0x30 <= *p && *p <= 0x39) r = r * 10 + *p - 0x30;
  9.   return r;
  10. }
  11.  
  12. double str2double(char *s)
  13. {
  14.   char *p;
  15.   double r = 0.0, f = 1.0;
  16.   for(p = s; *p; ++p)
  17.     if(0x30 <= *p && *p <= 0x39){
  18.       r = r * (f >= 1.0 ? 10 : 1) + (*p - 0x30) * (f >= 1.0 ? 1 : f);
  19.       if(f < 1.0) f *= 0.1;
  20.     }else f *= 0.1;
  21.   return r;
  22. }
  23.  
  24. int main(int ac, char **av)
  25. {
  26.   fprintf(stdout, "%d\n", str2int("9240"));
  27.   fprintf(stdout, "%f\n", str2double("0.0543"));
  28.   fprintf(stdout, "%f\n", str2double("9240.0543"));
  29.   fprintf(stdout, "%d\n", str2int("9240.0"));
  30.   return 0;
  31. }
Success #stdin #stdout 0s 2292KB
comments (?)
stdin
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Standard input is empty
stdout
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9240
0.054300
9240.054300
92400
https://ideone.com/tu8lrG
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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