如何在C中连接字符串和整数? [英] How to concatenate string and int in C?

问题描述

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:

I need to form a string, inside each iteration of the loop, which contains the loop index 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;
}

我尝试使用 strcat 和 itoa 的各种组合，但没有成功.

I tried using various combinations of strcat and itoa with no luck.

推荐答案

字符串在 C 中很困难.

Strings are hard work in C.

#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
   }
}

12是足够的字节来存储文本"pre_"，文本"_suff"，最多两个字符的字符串("99") 和 C 字符串缓冲区末尾的 NULL 终止符.

The 12 is 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.

这篇会告诉你如何使用snprintf，但我推荐一本好的 C 书！

This will tell you how to use snprintf, but I suggest a good C book!

这篇关于如何在C中连接字符串和整数?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！