Question

How to extract the first two words from a string in C

Answer 1

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

void FirstNWords(char str[], int N, char *p) {
    char *delimiter = " ";
    char *token = strtok(str, delimiter);

    while (N != 0 && token != NULL) {
        strcat(strcat(p, token), " ");
        token = strtok(NULL, delimiter);
        N--;
    }
}


int main()
{
    char s[] = "c c++ javascript python c# php";
    int N = 2;

    char *p = (char*) calloc(strlen(s) + 1, sizeof(char));

    FirstNWords(s, N, p);

    puts(p);

    free(p);

    return 0;
}





/*
run:

c c++

*/

 

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Answer 2

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

int main()
{
    char s[] = "c c++ javascript python c# php";

    char *p = (char*) calloc(strlen(s) + 1, sizeof(char));

    char *delimiter = " ";
    strcat(strcat(p, strtok(s, delimiter)), " ");
    strcat(p, strtok(NULL, delimiter));

    puts(p);

    free(p);

    return 0;
}





/*
run:

c c++

*/

 

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