对argv中的参数使用条件

如何处理几个短期期权的问题始终是快速 strcmp 或 getopt 如上所述使用。对于一些选项 字符串比较函数 。下面是使用 字符串比较函数 使用您的选项:

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

int main (int argc, char *argv[])
{
    if (argc < 7) {
        fprintf (stderr, "Error, insufficient input.\n  Usage: %s -d <string> -m <char> -t <int>\n", argv[0]);
        return 1;
    }

    int it;
    char *str = NULL;
    char chr;
    int  num;

    for (it = 1; it < argc; it++) {
        if (strcmp ("-d", argv[it]) == 0 && it < (argc - 1))
            str = strdup (argv[it+1]);
        if (strcmp ("-m", argv[it]) == 0 && it < (argc - 1))
            chr = *argv[it+1];
        if (strcmp ("-t", argv[it]) == 0 && it < (argc - 1))
            num = atoi (argv[it+1]);
    }

    printf ("\nOptions entered:\n\n");
    printf ("  str: %s\n  chr: %c\n  num: %d\n\n", str, chr, num);

    return 0;
}

编译:

gcc -Wall -Wextra -o bin/opts opts.c

运行:

$ ./bin/opts -d "this is my string" -m c -t 2048

输出:

Options entered:

  str: this is my string
  chr: c
  num: 2048