Basic unit analysis in C language

Analysis of basic units in C language

When learning C language, it is very important to understand the basic units in C language. The basic units in C language include characters, integers, floating point numbers, arrays, etc. This article will analyze these basic units separately, with specific code examples.

1. Characters

In C language, characters are one of the basic data types. Characters are stored in the form of ASCII codes in C language, and each character corresponds to an ASCII code. We can use single quotes to represent a character.

The following is a sample code that shows how to declare and initialize a character:

#include <stdio.h>

int main() {
    char ch = 'A';
    
    printf("字符：%c
", ch);
    
    return 0;
}

Running the above code, the output is: Character: A.

2. Integers

Integers in C language are also very commonly used data types. Integers can be divided into signed integers and unsigned integers. Signed integers can represent positive numbers, negative numbers and 0, while unsigned integers can only represent positive numbers and 0.

The following is a sample code that shows how to declare and initialize an integer:

#include <stdio.h>

int main() {
    int num = 10;
    unsigned int unum = 20;
    
    printf("整数：%d
", num);
    printf("无符号整数：%u
", unum);
    
    return 0;
}

Run the above code, the output result is: integer: 10, unsigned integer: 20.

3. Floating-point numbers

Floating-point numbers are used to represent values ​​with decimal points in C language, including single-precision floating-point numbers and double-precision floating-point numbers. Single-precision floating-point numbers are represented by the float type, and double-precision floating-point numbers are represented by the double type.

The following is a sample code that shows how to declare and initialize a floating point number:

#include <stdio.h>

int main() {
    float fnum = 3.14;
    double dnum = 6.28;
    
    printf("单精度浮点数：%f
", fnum);
    printf("双精度浮点数：%lf
", dnum);
    
    return 0;
}

Run the above code, the output result is: single precision floating point number: 3.140000, double precision floating point number: 6.280000.

4. Array

Array is a very commonly used data structure in C language, which can store a group of data of the same type. Array elements in C language are accessed through subscripts.

The following is a sample code that shows how to declare and initialize an integer array:

#include <stdio.h>

int main() {
    int arr[5] = {1, 2, 3, 4, 5};
    
    for(int i=0; i<5; i++) {
        printf("数组元素：%d
", arr[i]);
    }
    
    return 0;
}

Run the above code, the output result is:

Array elements: 1
Array elements: 2
Array elements: 3
Array elements: 4
Array elements: 5

Through the above code examples, we understand the basic units in C language: characters, A deeper understanding of integers, floating point numbers, and arrays. These basic units are the basic foundation of C language programming. Mastering these knowledge points will enable you to better program in C language.

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