如何在while循环C中连接两个字符串

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

int main() {
    char str1[50] = "Hello";
    char str2[] = " World";
    
    strcat(str1, str2);
    
    printf("连接后的字符串: %s\n", str1);
    
    return 0;
}

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

int main() {
    char str1[50] = "Hello";
    char str2[] = " World";
    
    strncat(str1, str2, sizeof(str1) - strlen(str1) - 1);
    
    printf("连接后的字符串: %s\n", str1);
    
    return 0;
}

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

int main() {
    char str1[50] = "Hello";
    char str2[] = " World";
    
    strcpy(str1 + strlen(str1), str2);
    
    printf("连接后的字符串: %s\n", str1);
    
    return 0;
}