问题描述
我有一个字符串,让我们说THESTRINGHASNOSPACES
我需要的东西,得到的4个字符的字符串从字符串。在第一次电话,我应该得到泰晤士报在第二,我应该得到TRIN。第三,我应该得到GHAS我该怎么办,在C?
I have a string, let's say "THESTRINGHASNOSPACES"I need something that gets a substring of 4 characters from the string. In the first call, i should get "THES" in the second, I should get "TRIN". in the third, I should get "GHAS" how can i do that in C?
推荐答案
如果该任务只复制4个字符,请尝试循环。如果它的将是更先进,你问一个函数,尝试函数strncpy。
http://www.cplusplus.com/reference/clibrary/cstring/strncpy/
If the task is only copying 4 characters, try for loops. If it's going to be more advanced and you're asking for a function, try strncpy. http://www.cplusplus.com/reference/clibrary/cstring/strncpy/
strncpy(sub1, baseString, 4);
strncpy(sub1, baseString+4, 4);
strncpy(sub1, baseString+8, 4);
或
for(int i=0; i<4; i++)
sub1[i] = baseString[i];
sub1[4] = 0;
for(int i=0; i<4; i++)
sub2[i] = baseString[i+4];
sub2[4] = 0;
for(int i=0; i<4; i++)
sub3[i] = baseString[i+8];
sub3[4] = 0;
preFER函数strncpy如果可能的话。
Prefer strncpy if possible.
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