介绍
toupper() 是一个用于将字符转换为大写的 C/C++ 函数,它位于 头文件中。使用 toupper 函数很简单,只需要将要转换的字符作为参数传递给它即可。
同理:tolower()是将一个字符转换为小写的函数。
isupper和islower 函数是 C/C++ 中用于检查字符是否为大小写字母的函数,位于 头文件中。它接受一个字符作为参数,并返回一个非零值(通常是 1),如果该字符是大写字母,则返回非零值.
示例
toupper()
#include <iostream>
#include <cctype>int main() {char lowercase = 'a';char uppercase = toupper(lowercase);cout << "小写字母是: " << lowercase << endl;cout << "大写字母是: " << uppercase << endl;return 0;
}
tolower()
#include <iostream>
#include <cctype>
int main() {char lowercase = 'A';char uppercase = tolower(lowercase);cout << "小写字母是: " << lowercase << endl;cout << "大写字母是: " << uppercase <<endl;return 0;
}
isupper()
#include <iostream>
#include <cctype>int main() {char character = 'A';if (isupper(character)) {cout << character << " is an uppercase letter." << endl;} else {cout << character << " is not an uppercase letter." << endl;}return 0;
}
islower()
#include <iostream>
#include <cctype>int main() {char character = 'a';if (islower(character)) {cout << character << " is an uppercase letter." << endl;} else {cout << character << " is not an uppercase letter." << endl;}return 0;
}
本篇完!