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  1. #include <ctype.h>
  2. #include <stdio.h>
  3. #include <string.h>
  4. #include <stdlib.h>
  5.  
  6. #define MAX_SIZE 100
  7.  
  8. char *findNumber(char *str1)
  9. {
  10.     char *num1 = malloc(MAX_SIZE);
  11.     // using "strlen(str1)+1" instead of MAX_SIZE might be preferred
  12.     int i = 0, j = 0;
  13.     while(str1[i] != '\0') {
  14.             if(isdigit(str1[i])) {
  15.                     num1[j] = str1[i];
  16.                     j++;
  17.             }
  18.             i++;
  19.     }
  20.     num1[j] = '\0';
  21.     return num1;
  22. }
  23.  
  24. int main(int argc, const char* argv[])
  25. {
  26.     char str2[] = "!3254";
  27.     printf(findNumber(str2));
  28.     return 0;
  29. }
Success #stdin #stdout 0s 1964KB
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stdin
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Standard input is empty
stdout
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3254
https://ideone.com/q32msD
language:
C (gcc 8.3)
created:
11 years ago
visibility:
secret

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