If Statement in C

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int x = 8;

int y = 0;

if statement

if(condition-expression)
{
    statement 1;
}
else
{
    statement 2;
}

if can appear without else

if(condition-expression)
{
    statement 1;
}

Some Condition Expressions

1. x == y means ( true only if x is compared equal to y )
2. x != y means ( true only if x is not equal to y )
3. x < y="" means="" (="" true="" only="" if="" x="" is="" less="" than="" y="">
4. x > y means ( true only if x is greater than y )
5. x <= y="" means="" (="" true="" only="" if="" x="" is="" less="" than="" or="" equal="" to="" y="">
6. x >= y means ( true only if x is greater than or equal to y )
7. cond1 && cond2 means (true only if both conditions are true)
8. cond1 || cond2 means (false only if both conditions are false)
9. !x means ( true only if x is 0 )

Ternary Operator

int y = (condition ? 7 : 9);

Even or odd using if-else

#include<iostream>
#include<cstdio>
 
using namespace std;
 
int main()
{ 

    int n;
    
    printf("Enter number =");
    
    cin >> n;
    
    if(0 == n%2)
    {
        printf("no is even = %d",n);
    }
    
    else
    {
        printf("number is odd = %d ",n);
    }
    
    return 0;
        
}

else - if

#include<iostream>
#include<cstdio>
 
using namespace std;
 
int main()
{ 
 
    int per;
    
    printf("enter the percentage = ");
    
    cin >> per;
    
    if (per > 80)
    {
        printf ("grade A");
    }
    else if (per > 70)
    {
        printf ("grade B");
    }
    else if (per > 60)
    {
        printf ("grade C");
    }
    else if (per > 50)
    {
        printf("grade D");
    }
    else
    {    
        printf("fail");
    }

    return 0;
    
}

if - else

#include<iostream>
#include<cstdio>
 
using namespace std;
 
int main()
{ 
 
    int age;
    
    cout << "Enter your age = ";
    
    cin >> age;
    
    if( age >= 18)
    {
        printf("Congrats... You can vote.");
    }
    
    else
    {
        printf("You can't vote...Alas..!");
    }
 
    return 0;
    
}

Pass and fail using if else

#include<iostream>
#include<cstdio>
 
using namespace std;
 
int main()
{ 
 
    int a, b, c, d, e;
    
    printf("Enter marks for five subjects: ");
    
    cin >> a >> b >> c >> d >> e ;
    
    int sum = a + b + c + d + e;
    
    int percent = ( sum * 100 )/500;
    
    if(percent > 40)
    {
        printf("student is pass");
    }
    else
    {
        printf("student i s fail");
    }
    
    return 0;
    
}

Use of if

#include<iostream>
#include<cstdio> 
 
using namespace std ;
 
int main()
{ 
 
    int num ; 
     
    cout << "Enter a number: " ;
     
    cin >> num ;
     
    if(num < 10)
    {
        cout<< "Less than 10" ;
    }
    else
    {
        cout<< "More than 10" ;
    }
     
    return 0 ;
    
}

switch statement

#include<iostream>
#include<cstdio> 
 
using namespace std; 
 
int main() 
{ 

    int day;
    
    cout << "Enter any no. 1 to 7";
    
    cin >> day ;
    
    switch(day)
    {
        
        case 1 : cout << "Sunday";
        
                 break;
        
        case 2 : cout << "Monday";
        
                 break;
        
        case 3 : cout << "Teusday";
        
                 break;
        
        case 4 : cout << "Wednesday";
        
                 break;
        
        case 5 : cout << "Thursday";
        
                 break;
    
        case 6 : cout << "Friday";
        
                 break;
        
        case 7 : cout << "Saturday";
        
                 break;
        
        default : cout << " Wrong choice";
        
    }
    
        return 0;
        
}

Ternary operator

#include<iostream>
#include<cstdio>

using namespace std; 
 
int main() 
{

     printf(" Enter a number:");
     
     int x; 
     
     cin>>x;
     
     int y = ( x > 5 ? printf(" > 5 ") : printf("not > 5 "));
     
     return 0 ;
     
}

Ternary operator aliter

#include<iostream>
#include<cstdio>

using namespace std; 
 
int main() 
{

     cout << " Enter a number:";
     
     int x; 
     
     cin>>x;
     
      cout << "The number is: "; 

     cout << (x > 5 ? ("") : ("not")) << endl;
     
     cout << " more than 5 " << endl;
     
     return 0 ;
     
}

nested if-else

#include<iostream>
#include<cstdio>
 
using namespace std;
 
int main()
{
    int age;
 
    cout<< "Enter your age: " ;
 
    cin>> age; 
 
    if (age <60) 
    { 
        char a;
 
        cout << "Physically Challanged?(Y/N): ";
 
        cin >> a; 
 
        if(('n' == a) || ('N' == a))
        {
            char b;
 
            cout << "Medically fit?(Y/N): ";
 
            cin >> b;
 
            if(('y' == b) || ('Y' == b))
            {
                cout<<"Eligible";
                return 0;
            }
            else 
            { 
                cout<< "In-eligible... medically unfit.";
            }
        } 
        else
        {
            cout<< "In-eligible... physically unfit.";
        }
    }
    else
    { 
        cout<< "Not eligible... Reason age.";
    }
 
    return 0;
 
}
     
     

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