c - Sscanf 问题和从命令行读取

Question

你好哈哈又来了。 C-Unix 我在读这样的东西:

a.out [23+10i]

sscanf(argv[count], "[%d%c%di]", &a, &operand1, &b);

我想分开如下: 一=23 b=10 操作数='+' 但是我收到了段错误(核心转储)错误，我做错了什么？

顺便说一句，非常感谢您回答我所有愚蠢的问题

Answer 1

对我有用

#include <stdio.h>
int main(int argc, char **argv) {
    int a, b;
    char operand1;
    int n;

    printf("scanning argv[argc - 1]: %s\n", argv[argc - 1]);
    /* It works for me */
    n = sscanf(argv[argc - 1], "[%d%c%di]", &a, &operand1, &b);

    printf("%d values read\n", n);
    if (n != 3) printf("there was an error in scanf ...\n");
    printf("The values were %d, %c, and %d\n", a, operand1, b);
    return 0;
}

和一个样本运行:

$ ./a.out [23+43i]
scanning argv[argc - 1]: [23+43i]
3 values read
The values were 23, +, and 43

注意 argv[argc] 是一个 NULL 指针。