Summary of the differences between for cycle and while cycle in C++

The difference between for and while cycles in C++

The biggest difference between the two is that the for loop 1 is applied to situations where the number of cycles is known, while the while loop 1 is applied to situations where the number of cycles is unknown. In general, the two can be converted to each other.

Take a simple example: take the sum of 1-100.

#include<bits/stdc++.h>
using namespace std;
int main(){
	int sum=0;
	for(int i=1;i<=100;i++){
		sum+=i;	
	}
	cout<<sum;
}

This is an example of using the for loop. The while loop is applied to solve this problem.

#include<bits/stdc++.h>
using namespace std;
int main(){
	int sum=0;
	int i=100;
	while(i--){
		sum+=i;	
	}
	cout<<sum;
}

And you can do the same thing.

For beginners to C++, most of the while cycle can be achieved through the for cycle.

Here's a handy example of using the while loop:

Find the sum of the digits of the input integer.

Input:

1 row 1 integer

Output:

An integer

Sample input:

2147483646

Sample output:

45

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,sum=0;
	cin>>n;
	while(n!=0){
		sum+=n%10;
		n/=10;
	}
	cout<<sum;
}

This example is a good example of an while loop.

conclusion