Question

How to extract only numbers from char array in C

Answer 1

#include <stdio.h> 
#include <string.h> 
#include <stdlib.h> 
#include <ctype.h> 
 
void extract_numbers(char *s, int len, char *numbers) { 
    int numbers_i = 0;
     
    for (int i = 0; i < len; i++) { 
        char ch = s[i]; 
        if (isdigit(ch)) 
            numbers[numbers_i++] = ch; 
    } 
    numbers[numbers_i] = '\0';
} 
    
int main() 
{ 
    char arr[] = "c++14$vb.net&%java*() php <>/python 3.7.3"; 
    char *numbers = (char *)malloc(strlen(arr) + 1 * sizeof(char));
     
    extract_numbers(arr, strlen(arr), numbers);
     
    puts(arr);
    puts(numbers);
     
    free(numbers);
      
    return 0; 
} 
    
    
    
/*
run:
    
c++14$vb.net&%java*() php <>/python 3.7.3
14373
  
*/

 

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