【IT领域新生必看】循环语法大揭秘：小白也能轻松掌握的入门指南

while condition:
    # 循环体
    # 更新

count = 0
while count < 5:
    print("这是第", count + 1, "次循环")
    count += 1

for i in range(5):
    print("这是第", i + 1, "次循环")

let count = 0;
while (count < 5) {
    console.log("这是第", count + 1, "次循环");
    count++;
}

for (let i = 0; i < 5; i++) {
    console.log("这是第", i + 1, "次循环");
}

int count = 0;
while (count < 5) {
    System.out.println("这是第" + (count + 1) + "次循环");
    count++;
}

for (int i = 0; i < 5; i++) {
    System.out.println("这是第" + (i + 1) + "次循环");
}

int count = 0;
do {
    System.out.println("这是第" + (count + 1) + "次循环");
    count++;
} while (count < 5);

int count = 0;
while (count < 5) {
    std::cout << "这是第" << (count + 1) << "次循环" << std::endl;
    count++;
}

for (int i = 0; i < 5; i++) {
    std::cout << "这是第" << (i + 1) << "次循环" << std::endl;
}

int count = 0;
do {
    std::cout << "这是第" << (count + 1) << "次循环" << std::endl;
    count++;
} while (count < 5);

count = 0
while count < 5
  puts "这是第#{count + 1}次循环"
  count += 1
end

for i in 0...5
  puts "这是第#{i + 1}次循环"
end

5.times do |i|
  puts "这是第#{i + 1}次循环"
end

numbers = [1, 2, 3, 4, 5]
for number in numbers:
    print("当前数字是：", number)

n = 5
factorial = 1
for i in range(1, n + 1):
    factorial *= i
print(f"{n} 的阶乘是：{factorial}")

for i in range(1, 10):
    for j in range(1, 10):
        print(f"{i} x {j} = {i * j}", end="\t")
    print()

while True:
    user_input = input("请输入一个数字（输入 'exit' 退出）: ")
    if user_input.lower() == 'exit':
        break
    elif user_input.isdigit():
        print("你输入的数字是：", int(user_input))
    else:
        print("无效输入，请重新输入")

matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
]

for row in matrix:
    for element in row:
        print(element, end=" ")
    print()

for i in range(1, 10):
    for j in range(1, 10):
        print(f"{i} x {j} = {i * j}", end="\t")
    print()

count = 0
while count < 5:
    print("这是第", count + 1, "次循环")
    # 忘记更新count，导致无限循环
    # count += 1

count = 0
while count < 5:
    print("这是第", count + 1, "次循环")
    count += 1
    # 条件检查错误，导致多执行一次循环
    # if count == 5:
    #     break

# 忘记初始化count，导致条件检查错误
# while count < 5:
#     print("这是第", count + 1, "次循环")
#     count += 1