Write a program that inputs a string from the keyboard and determines the length of the string. Print the string using twice the length as the field width

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编写一个程序，求字符串的长度

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根据给定的文件信息，我们可以总结出以下C语言的关键知识点： ### 1. 使用递归函数计算阶乘在C语言中，递归是一种通过函数自身调用来解决问题的方法。题目中的代码片段展示了如何使用递归函数`inv()`来计算一个数字的阶乘，并将其用于求解1到10的阶乘之和。然而，该代码存在一些语法错误，例如括号不匹配、分号使用不当等。正确的递归阶乘函数应如下所示： ```c #include <stdio.h> int factorial(int n) { if (n == 0 || n == 1) { return 1; } else { return n * factorial(n - 1); } } int main() { int sum = 0; for (int i = 1; i <= 10; i++) { sum += factorial(i); } printf("Sum = %d\n", sum); return 0; } ``` ### 2. 字符串连接函数 C语言中，可以通过循环和指针操作来实现两个字符串的连接。题目中给出的代码示例尝试实现这一功能，但是存在多个分号错误以及命名不规范的问题。正确的字符串连接函数可以写作： ```c #include <stdio.h> #include <string.h> void concatenate(char string1[], char string2[], char result[]) { int i; // 复制第一个字符串 for (i = 0; string1[i] != '\0'; i++) { result[i] = string1[i]; } // 追加第二个字符串 for (int j = 0; string2[j] != '\0'; j++, i++) { result[i] = string2[j]; } result[i] = '\0'; // 添加终止符 } int main() { char s1[20], s2[20], s3[40]; printf("Input string1: "); scanf("%s", s1); printf("Input string2: "); scanf("%s", s2); concatenate(s1, s2, s3); printf("Concatenated string: %s\n", s3); return 0; } ``` ### 3. 数组处理：求最高分、最低分和平均分 C语言中，数组常用于存储一系列数据，如学生分数。通过循环遍历数组，可以轻松地找到最大值、最小值和计算平均值。代码中存在一些细节问题，如`main()`函数声明、初始化变量和逻辑判断。修正后的代码如下： ```c #include <stdio.h> int main() { float scores[10], min, max, sum = 0; min = max = scores[0]; // 假设第一个元素是最小和最大值 printf("请输入10位同学的数学成绩: "); for (int i = 0; i < 10; i++) { scanf("%f", &scores[i]); sum += scores[i]; if (scores[i] > max) { max = scores[i]; } if (scores[i] < min) { min = scores[i]; } } float average = sum / 10; printf("最高分为: %.2f, 最低分为: %.2f, 平均为: %.2f\n", max, min, average); return 0; } ``` ### 4. 动态内存分配在C语言中，动态内存分配允许程序在运行时根据需要分配内存。`malloc()`函数用于为指定大小的数据类型分配内存。题目中的`create()`函数尝试实现这一点，但存在类型转换警告。改进后的代码如下： ```c #include <stdlib.h> char* create(int n) { return (char*)malloc(n * sizeof(char)); } int main() { char* str = create(10); free(str); return 0; } ``` ### 5. 数组元素交换题目中还提到了如何在数组中交换元素。这通常涉及到临时变量的使用，以便安全地交换两个值。正确的交换函数应包含完整的交换逻辑，包括寻址和值的交换。以上是对给定文件中提到的C语言知识点的详细解析，涵盖了递归函数、字符串操作、数组处理、动态内存分配和数组元素交换等关键概念。

Sure, here's an example program in Python: ```python string = input("Enter a string: ") length = len(string) print(f"{string:{length*2}}") ``` This program first prompts the user to enter a string using the `input()` function, and then calculates the length of the string using the `len()` function and stores it in the `length` variable. Finally, it uses an f-string to print the string with a field width of twice the length of the string, which is achieved by multiplying the length by 2 and passing it as the field width in the f-string. The `:` character is used to specify the field width in the f-string.

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Write a program that inputs a string from the keyboard and determines the length of the string. Print the string using twice the length as the field width

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