C语言 如何在C中连接字符串和整数？
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How to concatenate string and int in C?
提问by john
I need to form a string, inside each iteration of the loop, which contains the loop index i:
我需要在循环的每次迭代中形成一个字符串，其中包含循环索引i：
for(i=0;i<100;i++) {
// Shown in java-like code which I need working in c!
String prefix = "pre_";
String suffix = "_suff";
// This is the string I need formed:
// e.g. "pre_3_suff"
String result = prefix + i + suffix;
}
I tried using various combinations of strcatand itoawith no luck.
我试图使用的各种组合strcat，并itoa没有运气。
回答by Lightness Races in Orbit
Strings are hard work in C.
字符串在 C 中是一项艰巨的工作。
#include <stdio.h>
int main()
{
int i;
char buf[12];
for (i = 0; i < 100; i++) {
snprintf(buf, 12, "pre_%d_suff", i); // puts string into buffer
printf("%s\n", buf); // outputs so you can see it
}
}
The 12is enough bytes to store the text "pre_", the text "_suff", a string of up to two characters ("99") and the NULL terminator that goes on the end of C string buffers.
的12是足够的字节来存储文本"pre_"，文本"_suff"，最多两个字符（串"99"），并且继续C字符串缓冲区的端NULL结束。
Thiswill tell you how to use snprintf, but I suggest a good C book!
这个会告诉你怎么用snprintf，不过我推荐一本好的C书！
回答by Steve Jessop
Use sprintf(or snprintfif like me you can't count) with format string "pre_%d_suff".
使用sprintf（或者snprintf如果像我一样你无法计算）格式 string "pre_%d_suff"。
For what it's worth, with itoa/strcat you could do:
对于它的价值，使用 itoa/strcat 你可以做到：
char dst[12] = "pre_";
itoa(i, dst+4, 10);
strcat(dst, "_suff");
回答by vanza
Look at snprintfor, if GNU extensions are OK, asprintf(which will allocate memory for you).
查看snprintf或者，如果 GNU 扩展正常，则查看 asprintf（它将为您分配内存）。
