1.编程序输出图形：（使用循环结构）* * ****** *** * ***

以下是使用循环结构编写程序输出图形的示例代码：

# 输出矩形
for i in range(5):
    for j in range(6):
        print("*", end="")
    print()

# 输出椭圆
for i in range(5):
    for j in range(6):
        if (i == 0 or i == 4) and (j == 0 or j == 5):
            print(" ", end="")
        else:
            print("*", end="")
    print()

# 输出箭头
for i in range(5):
    for j in range(6):
        if i == 0 and (j == 0 or j == 5):
            print(" ", end="")
        elif i == 1 and (j == 1 or j == 4):
            print(" ", end="")
        elif i == 2 and (j == 2 or j == 3):
            print(" ", end="")
        else:
            print("*", end="")
    print()

# 输出菱形
for i in range(5):
    for j in range(5-i):
        print(" ", end="")
    for k in range(2*i+1):
        print("*", end="")
    print()
for i in range(4):
    for j in range(i+1):
        print(" ", end="")
    for k in range(7-2*i):
        print("*", end="")
    print()