Question

1. (sumFrom1.cpp) Write a program that will ask the user for a positive integer value. The program should use the for loop to get the sum of all the integers from 1 up to the number entered. For example, if the user enters 50, the loop will find the sum of 1, 2, 3, 4, ... 50. If the user enters a zero or negative number, a message should be given and the program should not continue (see Sample Run 3 below). Your prompt and output have to look exactly the same as the sample runs below. Sample Run 1 Enter a positive number: 10 The sum of all the numbers from 1 to 10 is 55. Sample Run 2 Enter a positive number: 5 The sum of all the numbers from 1 to 5 is 15. Sample Run 3 Enter a positive number: -1 -1 is invalid. Use the following structure. cin >> num; if(num is negative or zero) Display a message else //num is positive { Sum up all the numbers from 1 to the number entered using the for loop Output the result } return 0;

Answer 1

#include <iostream>

using namespace std;

int main(){

int num;

cout<<"Enter a positive number:";

cin>>num;

if(num<=0){

cout<<num<<" is invalid."<<endl;

}else{

int s=0;

for(int i=1;i<=num;i++){

s=s+i;

}

cout<<"The sum of all the numbers from 1 to "<<num<<" is "<<s<<"."<<endl;

}

return 0;

}

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 #include <iostream> using namespace std; int main() { int num; cout<<"Enter a positive number:"; cin>>num; if(num<=0) { cout<<num<<" is invalid."<<endl; }else{ int s=0; for(int i=1;i<=num; i++) { s=s+i; } cout<<"The sum of all the numbers from 1 to "<<num<<" is "<<s<<", "<<endl; } return 0; ) Terminal File Edit View Search Terminal Help user@user-Latitude - 3490:-/Desktop$ 9++ 1.cpp user@user-Latitude - 3490:-/Desktop$ ./a.out Enter a positive number: 10 The sum of all the numbers from 1 to 10 is 55. user@user-Latitude - 3490:-/Desktop$ ./a.out Enter a positive number: 5 The sum of all the numbers from 1 to 5 is 15. user@user-Latitude - 3490:-/Desktop$ ./a.out Enter a positive number: -1 -1 is invalid. user@user-Latitude - 3490:-/Desktops I

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