的strcat來連接A和B，而無需實際改變a或b

Question

我知道我可以有一個語句，這樣

strcat(a, b); 
    int alen = strlen(a); 
    printf("a and b concatenated = %s and its length is %d\n", a, alen); 

不過，我想保留一個，所以我想用更多的東西是這樣的：

strcat(a, b); 
    int xlen = strlen(x); 
    printf("a and b concatenated = %s and its length is %d\n", x, xlen); 

如何用strcat修復第一行，以便將a和b連接成x？

Answer 1

你應該使用下列內容： -

strcpy(x,a); 
strcat(x,b); 
int xlen = strlen(x); 
printf("a and b concatenated = %s and its length is %d\n", x, xlen); 

瞧，這就是它。

Answer 2

我發現下面的作品，以及：

/* Concatenate a and b */ 
    char x[SIZE1+SIZE2] = 「」; 
    strcat(x , a); 
    strcat(x , b); 

    printf("a and b concatenated = %s and its length is %d\n", x, (int)strlen(x));