C语言 如何检查一个字符串是否在C中的字符串数组中？
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How to check if a string is in an array of strings in C?
提问by Nakib
How to write below code in C? Also: is there any built in function for checking length of an array?
如何用C编写以下代码？另外：是否有任何用于检查数组长度的内置函数？
Python Code
Python代码
x = ['ab', 'bc' , 'cd']
s = 'ab'
if s in x:
//Code
采纳答案by user93353
There is no function for checking length of array in C. However, if the array is declared in the same scope as where you want to check, you can do the following
C中没有检查数组长度的函数。但是，如果数组声明在与您要检查的范围相同的范围内，则可以执行以下操作
int len = sizeof(x)/sizeof(x[0]);
You have to iterate through x and do strcmp on each element of array x, to check if s is the same as one of the elements of x.
您必须遍历 x 并对数组 x 的每个元素执行 strcmp，以检查 s 是否与 x 的元素之一相同。
char * x [] = { "ab", "bc", "cd" };
char * s = "ab";
int len = sizeof(x)/sizeof(x[0]);
int i;
for(i = 0; i < len; ++i)
{
if(!strcmp(x[i], s))
{
// Do your stuff
}
}
回答by nvlass
Something like this??
这种东西？？
#include <stdio.h>
#include <string.h>
int main() {
char *x[] = {"ab", "bc", "cd", 0};
char *s = "ab";
int i = 0;
while(x[i]) {
if(strcmp(x[i], s) == 0) {
printf("Gotcha!\n");
break;
}
i++;
}
}
回答by Matheus Santana
A possible C implementation for Python's inmethod could be
Pythonin方法的一个可能的 C 实现可能是
#include <string.h>
int in(char **arr, int len, char *target) {
int i;
for(i = 0; i < len; i++) {
if(strncmp(arr[i], target, strlen(target)) == 0) {
return 1;
}
}
return 0;
}
int main() {
char *x[3] = { "ab", "bc", "cd" };
char *s = "ab";
if(in(x, 3, s)) {
// code
}
return 0;
}
Note that the use of strncmpinstead of strcmpallows for easier comparison of string with different sizes. More about the both of them in their manpage.
请注意，使用strncmp代替strcmp可以更轻松地比较不同大小的字符串。更多关于他们的信息在他们的手册页。
回答by Dimitar Slavchev
There is a function for finding string length. It is strlenfrom string.h
有一个用于查找字符串长度的函数。它strlen来自string.h
And then you could use the strcmpfrom the same header to compare strings, just as the other answers say.
然后您可以使用strcmp来自同一标题的 来比较字符串，就像其他答案所说的那样。
