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C is a powerful programming language that is widely used to create operating systems , embedded systems and high-performance applications. This guide will take you on a journey into C programming, starting with the basics and walking you step-by-step through its key concepts.
Before you begin, you need to install the C compiler. The following options are recommended:
Let’s start with a simple “Hello, world!” program:
#include <stdio.h> int main() { printf("你好,世界!\n"); return 0; }
#include ade979de5fc0e1ca0540f360a64c230b: This is a preprocessor directive that includes the standard input/output library and allows you to use the printf()
functions .
int main(): This is the entry point of the program, it defines the main
function.
printf("Hello, world! n"): The printf()
function is used to output text to the screen.
return 0;: This is the return value of the main
function, which indicates successful execution of the program.
C has various data types to represent different data values:
Use the const
keyword to declare constants, for example:
const int MY_CONSTANT = 10;
C provides statements to control the flow of program execution:
for
loop and while
loop. Functions are reusable blocks of code. You can define a function that does not return a value by using the void
keyword, for example:
void print_message() { printf("这是来自函数的消息!\n"); }
#include <stdio.h> #include <math.h> int main() { float radius; printf("请输入圆的半径:"); scanf("%f", &radius); float area = M_PI * radius * radius; printf("圆的面积为:%f\n", area); return 0; }
This program prompts the user for input The radius of a circle, calculates the area of the circle and prints the result.
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