C语言编程技巧：常见写法示例及代码解析

"C语言编程技巧：常见写法示例及代码解析"\n\n本文将带您深入了解C语言的各种编程技巧，通过代码示例展示常见的写法，如Hello World程序、输入输出、判断素数、递归计算阶乘等，帮助您理解C语言编程的基本概念和应用。\n\n1. Hello World 程序：\nc\n#include <stdio.h>\n\nint main() {\n printf("Hello, World!");\n return 0;\n}\n\n\n2. 输入两个数并求和：\nc\n#include <stdio.h>\n\nint main() {\n int num1, num2, sum;\n printf("Enter two numbers: ");\n scanf("%d %d", &num1, &num2);\n sum = num1 + num2;\n printf("Sum: %d", sum);\n return 0;\n}\n\n\n3. 判断一个数是否为素数：\nc\n#include <stdio.h>\n\nint main() {\n int num, i, flag = 0;\n printf("Enter a number: ");\n scanf("%d", &num);\n for (i = 2; i <= num / 2; ++i) {\n if (num % i == 0) {\n flag = 1;\n break;\n }\n }\n if (num == 1) {\n printf("1 is neither prime nor composite.");\n } else {\n if (flag == 0)\n printf("%d is a prime number.", num);\n else\n printf("%d is not a prime number.", num);\n }\n return 0;\n}\n\n\n4. 使用递归计算阶乘：\nc\n#include <stdio.h>\n\nint factorial(int n) {\n if (n == 0)\n return 1;\n else\n return n * factorial(n - 1);\n}\n\nint main() {\n int num;\n printf("Enter a positive integer: ");\n scanf("%d", &num);\n printf("Factorial of %d = %d", num, factorial(num));\n return 0;\n}\n\n\n这些只是一些常见的写法示例，C语言的写法还有很多种，具体的写法取决于实际需求和个人编码风格。