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This article mainly introduces the C language strcpy library function how to use, the article introduces in great detail, has a certain reference value, interested friends must read!

Explanation of strcpy Library functions in C language A brief introduction to 1:MSDN about strcpy Library functions

Train of thought:

1. From MSDN's introduction to the strcpy library function above, we can see that the first parameter passed into the function is the target array, which is used to receive the copied string, and the second parameter is the source array, which copies the string of this parameter to the target array. Be sure to note that the space size of the target array must be larger than that of the source array, otherwise an error will be reported even if the copy is successful! )

two。 In our self-implementation of the strcpy library function, our source parameter is a constant string, since it is used to be copied can not be modified, so it is best to use the const keyword to modify, so that it has a constant attribute, of course, the source parameter can not be an empty string, so use the assert library function for assertion to prevent the program from crashing when passing an empty string.

3. We use a while loop to copy the moving characters step by step, that is, each time the while loop is executed, the two pointers gradually move backward, and the loop stops when it encounters\ 0.

The code is implemented as follows:

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