27、C语言字符串处理：从基础到高级应用

C语言字符串处理：从基础到高级应用

1. 二维字符数组的声明与使用

在C语言中，我们可以声明一个二维字符数组来存储多个字符串。例如：

char str[][70] = {
    "Computers do what you tell them to do, not what you want them to do.",
    "When you put something in memory, remember where you put it.",
    "Never test for a condition you don't know what to do with."
};

这里，第一维的大小由初始化字符串的数量决定，第二维的大小要足够容纳最长的字符串，再加上一个字符用于存储字符串结束符 \0 。

我们可以通过嵌套循环来计算每个字符串的长度：

unsigned int strCount = sizeof(str) / sizeof(str[0]);
for (unsigned int i = 0; i < strCount; ++i) {
    unsigned int count = 0;
    while (str[i][count])
        ++count;
    printf("The string:\n    \"%s\"\n contains %u characters.\n", str[i], count);
}