int main() { int n,m,i,sum=0; cin>>n>>m; for( i=49;i<=m;i++) { sum+=i%10; i=i/10; sum=sum+i; if(sum==13) cout<<i<<endl; } return 0; }

This program reads two integers n and m from the user and then loops through all integers from 49 to m.

For each integer i in the loop, the program calculates the sum of its digits using the modulo operator and integer division. This sum is stored in the variable sum.

Then, the program divides i by 10 and adds the result to the sum variable. If the resulting sum is equal to 13, the program prints i to the console.

Note that there is a syntax error in the program: the loop condition should be i<=m instead of i to avoid an infinite loop. Additionally, there is no need to declare the variable sum outside of the loop.

Here is a corrected version of the program:

#include <iostream>
using namespace std;

int main() {
    int n, m;
    cin >> n >> m;
    for (int i = 49; i <= m; i++) {
        int sum = 0;
        int temp = i;
        while (temp > 0) {
            sum += temp % 10;
            temp /= 10;
        }
        sum += i / 10;
        if (sum == 13) {
            cout << i << endl;
        }
    }
    return 0;
}

This version of the program correctly calculates the sum of digits of each integer using a while loop and a temporary variable. It also declares the sum variable inside the loop to avoid reusing its value from previous iterations.