78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
// 设计函数 char (*tok(char *s, const char *delim))[100] ，实现s按给定的分隔符分隔出所有的内容，并返回分隔之后的二维数组指针。
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// 示例：
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// char s[] = "Hello,World,How,Are,You";
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// const char delim[] = ",";
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// char(*tokens)[100] = tok(s, delim);
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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char (*tok(char *s, const char *delim))[100]
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{
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// 计算分隔符的长度
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size_t delim_len = strlen(delim);
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// 计算字符串中分隔符的个数
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int count = 1;
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char *p = s;
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while (*p != '\0')
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{
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if (strncmp(p, delim, delim_len) == 0)
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{
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count++;
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p += delim_len; // 跳过分隔符
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}
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else
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{
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p++;
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}
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}
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// 分配存储结果的二维数组
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char(*tokens)[100] = malloc(count * sizeof(*tokens));
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// 分隔字符串
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int i = 0;
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p = s;
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char *token_start = p;
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while (*p != '\0')
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{
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if (strncmp(p, delim, delim_len) == 0)
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{
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strncpy(tokens[i], token_start, p - token_start);
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tokens[i][p - token_start] = '\0';
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i++;
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p += delim_len; // 跳过分隔符
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token_start = p;
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}
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else
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{
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p++;
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}
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}
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// 处理最后一个分隔符后的部分
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strncpy(tokens[i], token_start, p - token_start);
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tokens[i][p - token_start] = '\0';
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return tokens;
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}
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int main()
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{
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char s[] = "Hello,World,How,Are,You";
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const char delim[] = ",";
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char(*tokens)[100] = tok(s, delim);
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// 打印分隔后的结果
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for (int i = 0; tokens[i][0] != '\0'; i++)
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{
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printf("%s\n", tokens[i]);
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}
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// 释放内存
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free(tokens);
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return 0;
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} |