是否有内置函数用逗号分隔C,C++或JavaScript中的数字？

#include <stdio.h>
#include <string.h>

int main() {
    int num = 12345;
    char str[20];
    sprintf(str, "%d", num);
    
    char* token = strtok(str, ",");
    while (token != NULL) {
        printf("%s\n", token);
        token = strtok(NULL, ",");
    }
    
    return 0;
}

var num = 12345;
var str = num.toString();

var tokens = str.split(",");
for (var i = 0; i < tokens.length; i++) {
    console.log(tokens[i]);
}