使用putchar输出一段英文

Sure, here's an example of using putchar to output a string of English text:

#include <stdio.h>

int main() {
    char str[] = "Hello, world!";
    int i = 0;
    while (str[i] != '\0') {
        putchar(str[i]);
        i++;
    }
    return 0;
}

This program declares a string variable `str` containing the text "Hello, world!", and then uses a loop to iterate over each character in the string and output it using putchar. The loop continues until it reaches the null terminator character '\0', which marks the end of the string.