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C++ program to iterate over array

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Release： 2023-09-01 17:09:17

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C++ program to iterate over array

Array is a continuous storage of the same type of data in memory. To access or address an array, we use the starting address of the array. Arrays have indexing, using which When addressing an array, we use the starting address of the array. Arrays have indexes and can be accessed through indexes We can access the elements of the array. In this article, we will introduce ways to iterate over arrays Operate on an array. This means accessing the elements present in the array.

Use for loop

The most common way to iterate over an array is to use a for loop. We use a for loop to In the next example, iterate over an array. One thing to note is that we need the size of the array array in this.

grammar

for ( init; condition; increment ) {
   statement(s);
}

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algorithm

Enter data in the array arr of size n.
For i := 0 to i := n, execute:

Print(arr[i])

The Chinese translation of

Example

is:

Example

#include <iostream>
#include <set>
using namespace std;

// displays elements of an array using for loop
void solve(int arr[], int n){
   for(int i = 0; i < n; i++) {
      cout << arr[i] << ' ';
   }
   cout << endl;
}
int main(){
   int arr[] = {10, 5, 11, 13, 14, 2, 7, 65, 98, 23, 45, 32, 40, 88, 32};
   int n = 15;
   cout << "Values in the array are: ";
   solve(arr, n);
   return 0;
}

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Output

Values in the array are: 10 5 11 13 14 2 7 65 98 23 45 32 40 88 32

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Use while loop

Similar to the for loop, we can use the while loop to iterate the array. In this case, it's also like this

The size of the array must be known or determined.

grammar

while(condition) {
   statement(s);
}

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algorithm

Enter data in the array arr of size n.
i := 0
while i < n, do:
- Print(arr[i])
- i := i 1

The Chinese translation of

Example

is:

Example

#include <iostream>
#include <set>
using namespace std;

// displays elements of an array using for loop
void solve(int arr[], int n){
   int i = 0;
   while (i < n) {
      cout << arr[i] << ' ';
      i++;
   }
   cout << endl;
}
int main(){
   int arr[] = {10, 5, 11, 13, 14, 2, 7, 65, 98, 23, 45, 32, 40, 88, 32};
   int n = 15;
   cout << "Values in the array are: ";
   solve(arr, n);
   return 0;
}

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Output

Values in the array are: 10 5 11 13 14 2 7 65 98 23 45 32 40 88 32

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Use forEach loop

We can also use a modern for-each loop to iterate over the elements in an array The main advantage is that we don't need to know the size of the array.

grammar

for (datatype val : array_name) {
   statements
}

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algorithm

Enter data in the array arr of size n.
For each element val in the array arr, perform the following operations:

print(val)

The Chinese translation of

Example

is:

Example

#include <iostream>
#include <set>
using namespace std;
int main(){
   int arr[] = {10, 5, 11, 13, 14, 2, 7, 65, 98, 23, 45, 32, 40, 88, 32};
   
   //using for each loop
   cout << "Values in the array are: ";
   for(int val : arr) {
      cout << val << ' ';
   }
   cout << endl;
   return 0;
}

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Output

Values in the array are: 10 5 11 13 14 2 7 65 98 23 45 32 40 88 32

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in conclusion

This article describes various methods of traversing arrays in C. The main methods include:

drawback of the first two methods is that the size of the array has to be known beforehand, But if we use for-each loop, this problem can be alleviated. for-each loop supports all STL container and easier to use.

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