c语言字符串的连接(c语言字符串的连接函数)

Introduction

C programming language is one of the most popular programming languages in the world. One of the interesting things about C programming is working with strings. String manipulation is an essential tool for any programmer, and it's no different for programming with C. C strings are a sequence of characters, and in C programming, we use arrays to represent strings. In this article, we will discuss how to combine or concatenate strings in C programming.

The strcat() function in C

The strcat() function is a built-in function in the string.h library. The strcat() function in C is used to concatenate two strings. The syntax of the strcat() function is as follows:

char *strcat(char *str1, const char * str2);

The strcat() function concatenates the string pointed to by str2 at the end of the string pointed to by str1. The function returns a pointer to the resulting string str1 after the concatenation. This means that the original string str1 is modified, and its length increases to accommodate the concatenated string str2.

Example Code for using strcat()

Let's look at an example code for using strcat() function in C:

#include<stdio.h>
#include<string.h>

int main()
{
    char str1[25] = "Hello";
    char str2[25] = "World";
    strcat(str1, str2);

    printf("The concatenated string is: %s", str1);

    return 0;
}

In the above code, we have declared two character arrays str1 and str2. We have initialized str1 with "Hello" and str2 with "World." Then we have used the strcat() function to concatenate str2 to the end of str1. Finally, we print the concatenated string using printf() function. The output of the above code will be:

The concatenated string is: HelloWorld

Conclusion

In conclusion, concatenating strings in C programming is made easy with the use of the built-in function strcat(). With this function, we can concatenate two strings in a simple and effective way. Understanding C strings and their manipulation is vital for any programmer working with C programming. By using strcat() function, we can easily concatenate strings and use them in our application.