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This article mainly introduces "how to use the replace () function in C++". In daily operation, I believe many people have doubts about how to use the replace () function in C++. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts about "how to use the replace () function in C++". Next, please follow the editor to study!

Replace algorithm:

The replace function is contained in the header file # include.

The generic algorithm replace replaces all values in the queue equal to the given value with another value, and the entire queue is scanned, that is, all versions of the algorithm are

Execute in linear time-its complexity is O (n).

That is, the execution of replace traverses the entire queue defined by the interval [frist,last) to replace old_value with new_value.

Here are nine uses of replace (): (compiling software dev5.4.0)

Usage 1: replace the specified string with a character of length len starting from the starting position pos with str

String& replace (size_t pos, size_t len, const string& str)

The code is as follows:

# include#includeusing namespace std;int main () {string str= "he is@ a @ good boy"; str=str.replace (str.find ("a"), 2, "#"); / / replace the two characters from the first a position with # cout

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