读入5个正整数并且显示它们。当程序读入的数据为负数时，程序立即终止。 **输入格式要求："%d" 提示信息："Please enter n:" **输出格式要求："n = %d\n" "Program is over!\n"

以下是代码实现：

#include <stdio.h>

int main() {
    int n;
    printf("Please enter n: ");
    scanf("%d", &n);
    while (n >= 0) {
        printf("n = %d\n", n);
        printf("Please enter n: ");
        scanf("%d", &n);
    }
    printf("Program is over!\n");
    return 0;
}

运行结果示例：

Please enter n: 1
n = 1
Please enter n: 3
n = 3
Please enter n: 5
n = 5
Please enter n: -1
Program is over!