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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <stdlib.h>
  4.  
  5. int main(void) {
  6.     char* str = "RING\n\n+CLIP: \"7987100500\",145,,,\"\",0";
  7.     char* number = "";
  8.     int max = 0;
  9.     for(int i = 0; i < strlen(str); i++){
  10.         int j = 0;
  11.         char *str2 = "";
  12.         char *str3 = "";
  13.         while(str[i] >= '0' && str[i] <= '9'){
  14.             j++;
  15.             size_t len = strlen(str2);
  16.             str3 = malloc(len + 2); /* one for extra char, one for trailing zero */
  17.             strcpy(str3, str2);
  18.             str3[len] = str[i];
  19.             str3[len + 1] = '\0';
  20.             if(strlen(str2))
  21.                 free(str2);
  22.             str2 = malloc(len+2);
  23.             strcpy(str2, str3);
  24.             free(str3);
  25.             if(i<strlen(str))
  26.                 i++;
  27.         }
  28.         if(j>max){
  29.             if(strlen(number))free(number);
  30.             number = malloc(strlen(str2)+2);
  31.             strcpy(number,str2);
  32.             number[strlen(str2)+1] = '\0';
  33.             max=j;
  34.         }
  35.     }
  36.  
  37.     printf("%s\n",number);
  38.     return 0;
  39. }
  40.  
Success #stdin #stdout 0s 2300KB
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7987100500
https://ideone.com/cXaq21
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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