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If you don’t know about push_back() function, See this: push_back() and pop_back() function in C
- Store the lines of the text file in a string vector using push_back() function.
- See here: Count the number of lines in a text file in C
- Count the number of total lines in the file using getline() function of C .
- Call the function srand() with argument ‘ time(0)’ or ‘ time(NULL)’ to make sure rand() function returns different random number for each call.
- Save the file in the same directory as the program.
- To fetch a random line from a text file in C , we need to follow the given steps. Fetch a random line from a text file in C We have to find a random number using rand() function and get a line from the text file. Start = Numbers.begin() // location of firstĮnd = Numbers.end() // one past the locationĬout << "After calling random_shuffle:\n" << endl įor more information about the random_shuffle function, visit random_shuffle (STL Samples).In this tutorial, we are going to learn how to fetch a random line from a text file in C . Define an iterator for template class vector of strings return an integral random number in the range 0 - (n - 1) disable warning C4786: symbol greater than 255 character, Copyright (c) 1996 Microsoft Corporation. of Microsoft Product Support Services,
Rand: Given n, generates an integral random number in the random_shuffle: Shuffle the elements in a random order. random_shuffle.cpp: Illustrates how to use the predicate version The predicate version of random_shuffle uses operator= to perform swaps. The pred has to be a function object that takes a parameter n and returns an integral random number in the range 0 to (n - 1). The predicate version uses the pred function to generate the indices of the elements to swap. The random_shuffle algorithm shuffles the elements of a sequence (first.last) in a random order. They have been modified to improve readability. The class/parameter names in the prototype do not match the original version in the header file.