Nested if-else statements in c++
/*A c++ program example that takes input from user for username and password and then makes decision.*/
// Program 1
#include <iostream>
#include <string>
using namespace std;
const string userName = "computergeek";
const string passWord = "break_codes";
int main ()
{
string name, pass;
cout << "Username: ";
cin >> name;
cout << "Password: ";
cin >> pass;
if (name == userName)
{
if (pass == passWord)
cout << "You are logged in!" << endl;
else
cout << "Incorrect username or password." << endl;
}
else
cout << "Incorrect username or password." << endl;
return 0;
}
/*A c++ program example that takes input from user for username and if username is correct then only asks for password and makes decision.*/
// Program 2
#include <iostream>
#include <string>
using namespace std;
const string userName = "computergeek";
const string passWord = "break_codes";
int main ()
{
string name, pass;
cout << "Username: ";
cin >> name;
if (name == userName)
{
cout << "Password: ";
cin >> pass;
if (pass == passWord)
cout << "You are logged in!" << endl;
else
cout << "Incorrect password." << endl;
}
else
cout << "Incorrect username." << endl;
return 0;
}
Programming Advice & Explanation:
Whenever possible avoid nesting or deep nesting as it makes program difficult to read. We should program in a manner that it can be read and understood easily by us and other programmers. For example, in the "Program 1" the nesting can be avoided by using logical operator. However in "Program 2" the nesting is required as we want to take input for password only if username is correct.
In the next chapter we will learn about logical operators and will rewrite the "Program 1" using it.
Please do comment if you don't understand any part or want to know more or just want to say thanks. I love programming and love to teach my friends. Your suggestions and appreciation will make this blog much better.
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hi,,,,,,,,,,,,,,,can i ask something?
ReplyDeleteYa ofcourse! :D
ReplyDeletewhat if if-else statement nested in an else.Any example ?
ReplyDeletewhat should i do if dnt want to display the password ....that is i want to display ******* in the password
ReplyDeletecould you pls tell me whats wrong here?
ReplyDeleteim a beginner.
#include
using namespace std;
int main()
{
int sc1, sc2, sc3, sc4, as, ave;
cout << "enter first score:\n" <> sc1;
cout << "enter second score:\n" <> sc2;
cout << "enter third score:\n" <> sc3;
cout << "enter fourth score:\n" <> sc4;
as = sc1 + sc2 + sc3 + sc4;
ave = as / 4;
cout << "average score is:\t" <=95)
cout << "grade is 1.50" <=90)
cout << "grade is 1.75" <=85)
cout << "grade is 2.0" <=80)
cout << "grade is 2.5" <=75)
cout << "grade is 3.0" <<endl;
else (ave<=74);
cout << "grade is 5.0" <<endl;
system ("pause");
return 0;
}
include the library
Deletei.e #include
etc..
#include
ReplyDeleteusing namespace std;
int main()
{
int sc1, sc2, sc3, sc4, as, ave;
cout << "enter first score:\n" <> sc1;
cout << "enter second score:\n" <> sc2;
cout << "enter third score:\n" <> sc3;
cout << "enter fourth score:\n" <> sc4;
as = sc1 + sc2 + sc3 + sc4;
ave = as / 4;
cout << "average score is:\t" <=95)
cout << "grade is 1.50" <=90)
cout << "grade is 1.75" <=85)
cout << "grade is 2.0" <=80)
cout << "grade is 2.5" <=75)
cout << "grade is 3.0" <<endl;
else (ave<=74);
cout << "grade is 5.0" <<endl;
system ("pause");
return 0;
}
hai!!i'am first time visit u blogger and i interesting to ask something about c++?
ReplyDeletecan u explain me..about the program at above..
why in #include not using iostream..i mean like this #include..??
hi! guys this written program doesnt work dont know why
ReplyDelete#include
ReplyDeleteusing namespace std;
int main()
{
char fname[10],lname[10],subj[10];
float a,b,c,d,e,itema,itemb,ave;
cout<<"Enter Name:";
cin>>fname>>lname;
cout<<"Subject:";
cin>>subj;
cout<<"Enter a Grade:";
cin>>a;
cout<<"Enter b grade:";
cin>>b;
cout<<"Enter c grade:";
cin>>c;
cout<<"Enter d grade:";
cin>>d;
itema=((a+b+c)/3)*0.5;
itemb=d*0.5;
ave=itema+itemb;
e=ave;
cout<<"**********************"<<"\n";
cout<<"Name:"<= 95) && (e <= 99))
{
cout << "1.25" << endl;
cout<< "Almost there, Strive more"<< endl;
}
else if ((e >= 90) && (e <= 94))
{
cout << "1.50" << endl;
cout<< "Damn, a little bit more"<< endl;
}
else if ((e >= 85) && (e <= 89))
{
cout << "2.0" << endl;
cout<< "You can do it next time"<< endl;
}
else if ((e >= 80) && (e <= 84))
{
cout << "2.5" << endl;
cout<< "Try again so it will be more easier"<< endl;
}
else if ((e >= 75) && (e <= 79))
{
cout << "3.0" << endl;
cout<< "OMG!you almost failed!"<< endl;
}
else if (e <= 74)
{
cout << "5.0" << endl;
cout<< "You SSSSStupid!Noob!!!"<< endl;
}
cout<<"**********************"<<"\n";
system("pause");
return 0;
}
just added some stuff
can i ask something??
ReplyDeletehow can i use nested if else using venn diagram?
How can I go about writing a nested if statement to calculate the weight of a person on a planet?
ReplyDeletehow can i improve it.
ReplyDeletethis just helped me to complete my assignment.... thanks a million
ReplyDeletecan you explain and give example nested if(if_else_if)
ReplyDeleteI want more and more articles and blogs please post soon such informative information.
ReplyDeletelearn c++