[英]C - Make variable INT as Char * for strcat
I'm trying to make a char * with the char representing an integer. 我正在尝试使用表示整数的char来生成char *。 So I have this so far 所以到目前为止我有这个
int x;
for(x=0;x<12;x++){
cp->name=strcat(tp->name, (char *)x);
}
name is char* The problem is the x portion. name是char *问题是x部分。 I get segmentation fault and I'm assuming it's because it can't access the address the contents of x and cast it as char * 我得到分段错误,我假设它是因为它无法访问地址x的内容并将其转换为char *
any tips on this? 关于这个的任何提示?
Thanks 谢谢
By casting x
to a char *
, you're telling the compiler, "I know what I'm doing. Treat x
as an address and pass it to strcat
" 通过将x
转换为char *
,您告诉编译器,“我知道我在做什么。将x
视为地址并将其传递给strcat
”
Because x
contains an integer between 0 and 12, strcat
is trying to access a char array at address at that number. 因为x
包含0到12之间的整数,所以strcat
尝试访问该数字的地址处的char数组。 Because that address in memory most likely doesn't belong to you, you're getting a segfault. 因为内存中的地址很可能不属于您,所以您会遇到段错误。
You'll need sprintf
or snprintf
for getting a string representation of the integer. 你需要sprintf
或snprintf
来获取整数的字符串表示。
For example: 例如:
int x;
for(x=0;x<12;x++){
char buffer[16];
snprintf(buffer, sizeof(buffer), "%d", x);
cp->name=strcat(tp->name, buffer);
}
You need to explicitly convert the number in x
into a string (=array of chars
). 您需要将x
的数字显式转换为字符串(= chars
数组)。 You can't do this by a mere type cast. 你不能仅仅通过类型转换来做到这一点。
Using sprintf()
is probably the easiest way: 使用sprintf()
可能是最简单的方法:
int x;
for (x = 0; x < 12; x++)
sprintf(tp->name + strlen(tp->name), "%d", x);
Needless to say, tp->name
must have enough space in it and it must be '\\0'
-terminated before you do the above. 不用说, tp->name
必须有足够的空间,并且在执行上述操作之前必须将'\\0'
终止。
In C, you can use sprintf(str,"%d",x)
; 在C中,您可以使用sprintf(str,"%d",x)
; or in C++ stringstream std::ostringstream oss; oss << tp->name << x;
或者在C ++中使用stringstream std::ostringstream oss; oss << tp->name << x;
std::ostringstream oss; oss << tp->name << x;
. 。 If you have no qualms with using non-standard function, you can also use non-standard itoa() function. 如果您对使用非标准功能没有疑虑,您也可以使用非标准的itoa()函数。
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