In addition to Weibo, there is also WeChat
Please pay attention
WeChat public account
Shulou
2025-09-24 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Network Security >
Share
Shulou(Shulou.com)06/01 Report--
There is a problem about the return value in the function in C language. the local variables in the function are mainly opened up on the stack, and the function variables are recycled. In view of the worthiness of function return, the following specific examples are given to illustrate:
The return value of a function is a local variable defined in the function
This type of return value can be used in the main function, because when returning a local variable is worth it, it is worth a copy, and that's all we need in the main function, so it's OK, for example.
Int fun (char * arr)
{
Int num = 0
While (* arr! ='\ 0')
{
Num = num * 10 + * arr -'0'
Arr++
}
Return num
Printf ("d", num)
}
Int main ()
{
Int tem = 0
Char * arr = "12345"
Tem = fun (arr)
Printf ("d", tem)
System ("pause")
Return 0
}
two。 The function returns the pointer variable defined in the function
Char * fun ()
{
Char * arr = "1234"
Return arr
}
Int main ()
{
Char * tem = fun ()
Printf ("% s", tem)
System ("pause")
Return 0
}
This is also correct in the process of running.
3. Function cannot return the address of a local variable
Int * fun ()
{
Int a = 10
Return & a
}
Int main ()
{
Int * tem = fun ()
Printf ("% d", * tem)
System ("pause")
Return 0
}
4. Function cannot return the first address of the array
Int * fun ()
{
Int arr [] = {1,2,3,4}
Return arr
}
Int main ()
{
Int * tem = fun ()
System ("pause")
Return 0
}
Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.
Views: 0
*The comments in the above article only represent the author's personal views and do not represent the views and positions of this website. If you have more insights, please feel free to contribute and share.
The market share of Chrome browser on the desktop has exceeded 70%, and users are complaining about
The world's first 2nm mobile chip: Samsung Exynos 2600 is ready for mass production.According to a r
A US federal judge has ruled that Google can keep its Chrome browser, but it will be prohibited from
Continue with the installation of the previous hadoop.First, install zookooper1. Decompress zookoope
About us Contact us Product review car news thenatureplanet
More Form oMedia: AutoTimes. Bestcoffee. SL News. Jarebook. Coffee Hunters. Sundaily. Modezone. NNB. Coffee. Game News. FrontStreet. GGAMEN
© 2024 shulou.com SLNews company. All rights reserved.