Introduction Data type Variable-Constant Keyword-Identifier Operations Input&Output If-else Switch loops String Array Functions Recursion-Function Mat-Function Pointers File handling Read & write Error handling Read & write error handling

The if statement is a powerful decision making statement, if it is condition true executes the given block of codes

  if(condition){
    // statements of code 
   }
            

 #include <stdio.h>

   int main() {
           
      int age;
      age=23;
      if(age>21){
         printf(" Your age is greater than 21");    
              } 
       return 0;
        }     

Note :- in this condition suppose age lesser then 21 means the condition not satisfy .

else is used to executes, if the first condition is false / if all condition not satisfied then else block statements executes defaultly.

    if(condition1){
        //statements1
    }
    else{
        //default statement   
    }
    

  #include <stdio.h>
    int main() {
     int age;
     age=23;
     int age1=21;
    //Taking decision 
     if(age < age1){
         printf("The age is greater then 23");
                  }
     else{
         printf("The age is lesser then 23");
        }
    }
        

Used to checking / testing different conditions one by one.

Like if the first condition is false , then check the secend condition until satisfing condition if not found in any condition then else block statements executes defaultly

#include <stdio.h>
   int main() {
     int age;
     age=23;
     int age1=21;
     if(age ==age1){
           printf("age is qual to the 21");
                   }
     else if(age < age1){
           printf("The age is lesser then 23");
                        }
     else{
 // output is Not found because anycondition is not satisfied
        printf("Not found "); 
           }
              }