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#include <iostream>
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#include <string.h>
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#include <stdio.h>
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using namespace std;
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char c_string[] =
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"1 2 3 4 5";
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char sepa[] = " ";
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char *token = NULL;
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char *next_token = NULL;
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int main()
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{
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    // Establish string and get the first token:
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    token = strtok_s(c_string, sepa, &next_token);
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    // While there are tokens in "string1" or "string2"
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    while (token != NULL)
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    {
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        // Get next token:
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        if (token != NULL)
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        {
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            printf_s(" %s\n", token);
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            token = strtok_s(NULL, sepa, &next_token);
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        }
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    }
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    printf("remain:\n");
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    printf("%d", token);
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}