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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <ctype.h>
  4.  
  5. double get_double(const char *str)
  6. {
  7.     /* First skip non-digit characters */
  8.     /* Special case to handle negative numbers */
  9.     while (*str && !(isdigit(*str) || ((*str == '-' || *str == '+') && isdigit(*(str + 1)))))
  10.         str++;
  11.  
  12.     /* The parse to a double */
  13.     return strtod(str, NULL);
  14. }
  15.  
  16. int main(void)
  17. {
  18.     char input1[] = "fasfasf-123.412412fasfff";
  19.     char input2[] = "fasf-asf123.412412fasfff";
  20.     char input3[] = "fasfasf-123.412412fasfff";
  21.     char input4[] = "fasf+asf123.412412fasfff";
  22.     char input5[] = "fasfasf+123.412412fasfff";
  23.  
  24.     printf("Input1 1: \"%s\"\n", input1);
  25.     printf("Double 1: %.10g\n", get_double(input1));
  26.     printf("Input  2: \"%s\"\n", input2);
  27.     printf("Double 2: %.10g\n", get_double(input2));
  28.     printf("Input  3: \"%s\"\n", input3);
  29.     printf("Double 3: %.10g\n", get_double(input3));
  30.     printf("Input  4: \"%s\"\n", input4);
  31.     printf("Double 4: %.10g\n", get_double(input4));
  32.     printf("Input  5: \"%s\"\n", input5);
  33.     printf("Double 5: %.10g\n", get_double(input5));
  34.  
  35.     return 0;
  36. }
  37.  
Success #stdin #stdout 0.01s 1720KB
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stdin
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Standard input is empty
stdout
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Input1 1: "fasfasf-123.412412fasfff"
Double 1: -123.412412
Input  2: "fasf-asf123.412412fasfff"
Double 2: 123.412412
Input  3: "fasfasf-123.412412fasfff"
Double 3: -123.412412
Input  4: "fasf+asf123.412412fasfff"
Double 4: 123.412412
Input  5: "fasfasf+123.412412fasfff"
Double 5: 123.412412
https://ideone.com/uop4ae
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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