Question

How to fill a vector with values in C++

Answer 1

#include <iostream>     
#include <vector>   

// fill(ForwardIterator first, ForwardIterator last, const T& val);

void printVector(std::vector<int> const &v) {
    for (auto const &n: v) {
        std::cout << n << " ";
    }
}

int main () 
{
    std::vector<int> vec(10);  
    
    printVector(vec);
    std::cout << '\n';

    std::fill(vec.begin(), vec.end(), -1); 
    
    printVector(vec);
    std::cout << '\n';
}

 
 
 
 
/*
run:
 
0 0 0 0 0 0 0 0 0 0 
-1 -1 -1 -1 -1 -1 -1 -1 -1 -1 
 
*/

 

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Answer 2

#include <iostream>     
#include <vector>   

// fill(ForwardIterator first, ForwardIterator last, const T& val);

void printVector(std::vector<int> const &v) {
    for (auto const &n: v) {
        std::cout << n << " ";
    }
}

int main () 
{
    std::vector<int> vec(10);  
    
    printVector(vec);
    std::cout << '\n';

    std::fill(vec.begin(), vec.begin() + 3, -1); 
    
    printVector(vec);
    std::cout << '\n';
}

 
 
 
 
/*
run:
 
0 0 0 0 0 0 0 0 0 0 
-1 -1 -1 0 0 0 0 0 0 0 
 
*/

 

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Answer 3

#include <iostream>     
#include <vector>   

// fill(ForwardIterator first, ForwardIterator last, const T& val);

void printVector(std::vector<int> const &v) {
    for (auto const &n: v) {
        std::cout << n << " ";
    }
}

int main () 
{
    std::vector<int> vec(10);  
    
    printVector(vec);
    std::cout << '\n';

    std::fill(vec.begin() + 3, vec.end() - 2, -1); 
    
    printVector(vec);
    std::cout << '\n';
}

 
 
 
 
/*
run:
 
0 0 0 0 0 0 0 0 0 0 
0 0 0 -1 -1 -1 -1 -1 0 0 
 
*/

 

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