c language array about the string problem

把第三行改为scanf("%s %s",&str1,&str2);
把第十三行改为printf("%s %s",str1,str2);
把第十九行改为printf("%s %s",str1,str2);

Hope to adopt

Using commas does not delimit input string.
Using %c to output string is also wrong

Here is my understanding for reference :

1. Because character array names are immutable, it is wrong to assign them. If you want to copy characters in character array, You can use the strcpy() function;

2. Then, using scanf() to get strings using commas makes getting input properly complicated, because scanf() gets strings by default separated by whitespace characters(that is, Spaces, tabs, or newlines), so it can be changed to two %s with or without a space;

3. Print the string in the character array using %s.

4. Finally, add scanf() at the end of the while to get the string to compare next time into the arrays str1 and str2.

Modify as follows: < br / > < br / > reference links: < br / > < a href = "https://baike.baidu.com/item/strcpy/5494519?fr=aladdin" id="textarea_1676975747591_1676975785543_0" rel="noopener noreferrer" target="_blank">

#include 
#include 

int main(void){
    
    int k;
    printf("输入两个字符串:");
    char str1[30],str2[30],str3[30];
    
    //  https://baike.baidu.com/item/scanf/10773316?fr=aladdin
    scanf("%s %s",str1,str2);  //在scanf()获取字符串不需要使用逗号分隔 
//    printf("s1=%s --- s2=%s\n",str1,str2); 
    
    while(1){
        
        k=strcmp(str1,str2);
        if(k>0){
        // // https://blog.csdn.net/weixin_63279307/article/details/128412296    
            printf("%s %s\n",str1,str2);  // 打印字符数组里的字符串使用%s即可 
        }else if(k<0){


//https://www.hyluz.cn/post/506.html
// https://baike.baidu.com/item/strcpy/5494519?fr=aladdin            
            strcpy(str3,str1); // 复制str1中的字符串到str3中 
            strcpy(str1,str2); // 复制str2中的字符串到str2中 
            strcpy(str2,str3); // 复制str3中的字符串到str2中 


            printf("%s %s\n",str1,str2);
        }else if(k==0){
            printf("请输入两个不同大小的字符串:"); 
        }
        scanf("%s %s",str1,str2);  // 获取下次需要比较的字符串到字符数组str1和str2中 
    //    printf("s1=%s -- s2=%s\n",str1,str2); 
    } 
    
    return 0;
}