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  1. #include <stdio.h>
  2. #include <ctype.h>
  3.  
  4. int strToInt(const char *text)
  5. {
  6.   int n = 0, sign = 1;
  7.   switch (*text) {
  8.     case '-': sign = -1;
  9.     case '+': ++text;
  10.   }
  11.   for (; isdigit(*text); ++text) n *= 10, n += *text - '0';
  12.   return n * sign;
  13. }
  14.  
  15. int main()
  16. {
  17.   const char *samples[] = {
  18.     "123", "-234", "+345", "abc", ""
  19.   };
  20.   enum { n = sizeof samples / sizeof *samples };
  21.   for (int i = 0; i < n; ++i) {
  22.     printf("strToInt(\"%s\"): %d\n", samples[i], strToInt(samples[i]));
  23.   }
  24.   return 0;
  25. }
Success #stdin #stdout 0s 9432KB
comments (?)
stdin
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Standard input is empty
stdout
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strToInt("123"): 123
strToInt("-234"): -234
strToInt("+345"): 345
strToInt("abc"): 0
strToInt(""): 0
https://ideone.com/qA6Yqh
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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