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Initialization of a normal array with one default value in C++
The entire array can be initialized to zero very simply. This is shown below.
int arr[10] = {0};However, it is not possible to initialize the entire array to a non-zero value using the above method. This is shown below.
int arr[10] = {5};In the above example, only the first element will be initialized to 5. All others are initialized to 0.
A for loop can be used to initialize an array with one default value that is not zero. This is shown below.
for(i = 0; i<10; i++) {
arr[i] = 5;
}In the above example, all the array elements are initialized to 5.
A program that demonstrates all the above examples is given as follows.
Example
#include <iostream>
using namespace std;
int main() {
int a[10] = {0};
int b[10] = {5};
int c[10];
for(int i = 0; i<10; i++) {
c[i] = 5;
}
cout<<"Elements of array a: ";
for(int i = 0; i<10; i++) {
cout<< a[i] <<" ";
}
cout<<"\n";
cout<<"Elements of array b: ";
for(int i = 0; i<10; i++) {
cout<< b[i] <<" ";
}
cout<<"\n";
cout<<"Elements of array c: ";
for(int i = 0; i<10; i++) {
cout<< c[i] <<" ";
}
cout<<"\n";
return 0;
}Output
The output of the above program is as follows.
Elements of array a: 0 0 0 0 0 0 0 0 0 0 Elements of array b: 5 0 0 0 0 0 0 0 0 0 Elements of array c: 5 5 5 5 5 5 5 5 5 5
Updated on: 26-Jun-2020
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