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May 10, 2022 08:38 am GMT

Selection statements | Difference between if else and else if

Selection statements

`if statement` `if~else statement`

ikki yoki undan ko'p execution pathlarni tanlaydi

if (a>=0)cout << "positive";if (a<0)cout << "negative";

If statement

if expression is true, execute statement1
- Syntax

if(expression){(body) statement1}

Example

if (a>=0)cout << "positive";

don't use semi-colon (;) after if(expression)
- Agar semi-colon ishlatilsa, if statement mustaqil bo'lib qoladi.
Agar if statementda faqat bitta statement bo'lsa {} qo'yilmaydi.

    int a,b,c;  cin >> a >> b >> c;  int max = a > b ? a : b;    if (max > c)      cout << max << endl;

Agar if statement condition bajarilmasa output da hech narsa chiqmaydi.
If statement faqat o'zidan keyingi birinchi turgan cout ga ta'sir qiladi.
Use == (Realtion operator), don't use = (Assignment)

    if (team == '10')    cout << "Lions" << endl;not    if (team = '10')        // result team is 10

If-else statement

If expression is true, execute statement1. If false, execute statement2
Syntax

if(expression){(body) statement1} else{(body) statement2}

Example

    if (son%2 == 0)    cout << "even" << endl;    else     cout << "odd" << endl;

if statement contains another if statement (including if-else statement)

if (a>=0)   if (x%2 ==0)   cout << "positive even number" << endl;   else    cout << "positive odd number" << endl;

else-if statement

Example

    if (a>='A' && a<='Z')    cout << "Upper-case" << endl;        else if (a>='a' && a<= 'z')        cout << "Lower-case" << endl;            else if (a>='0' && a<='9')            cout << "Number" << endl;                else                 cout << "Others" << endl;

Original Link: https://dev.to/mohira21/selection-statements-difference-between-if-else-and-else-if-4icd

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