Python:
```python
name = input("请输入你的名字:")
print("你好," + name + "!")
```
Java:
```java
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入一个数字");
int n = sc.nextInt();
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= n - i; j++) {
System.out.print(" ");
}
for (int j = 1; j <= 2 * i - 1; j++) {
System.out.print("*");
}
System.out.println();
}
}
}
```
C语言:
```c
include
int main() {
int i, j, rows = 4;
for (i = 1; i <= rows; ++i) {
for (j = 1; j <= i; ++j) {
printf(" ");
}
for (j = 1; j <= 2 * i - 1; j++) {
printf("*");
}
printf("\n");
}
return 0;
}
```
这些示例分别展示了如何在Python、Java和C语言中输入四行代码,并执行相应的操作。你可以根据需要选择合适的编程语言和示例。